Zoning › Iowa › Woodbury County › Sioux City

Sioux City, IA Zoning

Euclidean-zoning. 16 districts · 5 overlays · 9 applicable state preemptions.

Overview

Code type
euclidean
Naming convention
use-type-index

Residential districts use descriptive type codes (AG, RR, SR, GR, UR, NC); nonresidential use function codes (SC, GC, DC, BP, GI, MU). NC has 5 sub-districts (NC.1-NC.5). HA special district has 3 sub-districts (HA-4, HA-P, HA-N).

Worth knowing
  • Sioux City uses a hybrid district system: new growth areas use RR/SR/GR/UR with standard neighborhood types; established neighborhoods use NC sub-districts (NC.1-NC.5) with their own dimensional table (§25.03.020.3) that differs from the growth-area standards.
  • The CE (Casino Entertainment) District is mapped only around the Hard Rock Hotel and Casino / Gateway Arena area near the Missouri River waterfront. CE requires a site plan for all development and does not use the standard parking calculation table.
  • Table 25.03.030.3A provides dimensional standards for single-family development broken down by neighborhood type (Standard, Cluster, Planned) within each residential district — so RR, SR, and GR each have up to 3 sub-rows with different lot sizes and setbacks.

+ 5 more in Quirks & notes

Districts

res_sf 6res_mf 3com 2ag 1mu 1cbd 1off 1ind 1
CodeNameCategory Min lotHeight CoverageFAR Du/acParking Setbacks F/S/R
AGAgriculturalag871,200 sf[4]45 ft[5]0.05[6]—[7]——[8]50[1] / 75[2] / 75[3]
RRRural Residentialres_sf435,600 sf[12]45 ft[13]0.05[14]—[15]——[16]50[9] / 50[10] / 75[11]
SRSuburban Residentialres_sf87,120 sf[20]45 ft[21]0.05[22]—[23]——[24]50[17] / 15[18] / 75[19]
GRGeneral Residentialres_sf12,000 sf[28]35 ft[29]0.35[30]—[31]——[32]35[25] / 7[26] / 30[27]
URUrban Residentialres_mf4,500 sf[36]35 ft[37]0.5[38]—[39]——[40]20[33] / 4[34] / 18[35]
NC.1Neighborhood Conservation NC.1res_sf43,560 sf[44]35 ft[45]0.1[46]—[47]——[48]35[41] / 20[42] / 35[43]
NC.2Neighborhood Conservation NC.2res_sf7,000 sf[52]35 ft[53]0.3[54]—[55]——[56]25[49] / 5[50] / 25[51]
NC.3Neighborhood Conservation NC.3res_sf6,000 sf[60]35 ft[61]0.3[62]—[63]——[64]25[57] / 5[58] / 25[59]
NC.4Neighborhood Conservation NC.4res_mf5,000 sf[68]35 ft[69]0.4[70]—[71]——[72]25[65] / 5[66] / 25[67]
NC.5Neighborhood Conservation NC.5res_mf5,000 sf[76]75 ft[77]0.8[78]—[79]——[80]25[73] / 5[74] / 10[75]
MUMixed Usemu87,120 sf[84]55 ft[85]0.28[86]0.28[87]——[88]25[81] / 15[82] / 25[83]
SCSuburban Commercialcom7,500 sf[92]35 ft[93]0.32[94]0.32[95]——[96]25[89] / 10[90] / 20[91]
GCGeneral Commercialcom15,000 sf[100]65 ft[101]0.29[102]0.29[103]——[104]25[97] / 15[98] / 25[99]
DCDowntown Commercialcbd—[106]—[107]——[108]——[109]0[105] / — / —
BPBusiness Parkoff10,000 sf[113]60 ft[114]—[115]0.37[116]——[117]30[110] / 20[111] / 30[112]
GIGeneral Industrialind10,000 sf[121]-1 ft[122]—[123]0.42[124]——[125]20[118] / 20[119] / 20[120]

Confidence: confirmed partial under review not found

Overlays

AP
Airport Protection District
AP
§25.02.060.1

Lands within the corporate limits of Sioux City within the airport hazard zones of Siouxland Gateway Airport as defined on the airport hazard zoning map adopted by City Council [confirmed §25.02.060.1 items 8 and 22]

primary_purposeProtect Siouxland Gateway Airport operations from encroachment of incompatible uses [confirmed §25.02.040]
governing_lawIowa Code Chapter 329, Airport Zoning; 14 CFR §77 [confirmed §25.02.060.1 items 2, 9]
permit_requiredAirport Zoning Commission permit required for new structures and substantial changes; structures under 75-ft exempt in horizontal/conical/transition zones [confirmed §25.02.060.1 items 12-13]
height_limits{"instrument_approach_zone": "1:50 slope beginning 200-ft from runway end to 10,200-ft; then 1:40 to 50,200-ft [confirmed §25.02.060.1 item 20a]", "non_instrument_approach_zone": "1:40 slope beginning 200-ft from runway end to 10,200-ft [confirmed §25.02.060.1 item 20b]", "transition_zones": "1:7 slope from 500-ft of runway centerline upward to max 150-ft above airport elevation (1,097-ft MSL) [confirmed §25.02.060.1 item 20c]", "horizontal_zone": "150-ft above airport elevation (1,097-ft MSL) [confirmed §25.02.060.1 item 20d]", "conical_zone": "1:20 slope from horizontal zone periphery (1,247-ft) outward 4,000-ft [confirmed §25.02.060.1 item 20e]", "exception": "No structure prohibited from reaching 45-ft above ground [confirmed §25.02.060.1 item 21]"}
permitted_usesAirport uses, BP and GI district uses not hazardous to aircraft [confirmed §25.02.060.1 item 16]
avigation_easementMay be required on development approvals within airport hazard area [confirmed §25.02.060.1 item 11]
airport_nameSiouxland Gateway Airport (KSUX)
CE
Casino Entertainment District
SPD
§25.02.060.2

Properties mapped as CE District on the Official Zoning Map; limited to casino/gambling entertainment and associated uses [confirmed §25.02.060.2 items 2-3]

primary_purposeStandards for gambling casinos and entertainment uses due to scale and unique development characteristics [confirmed §25.02.060.2 item 1]
site_plan_requiredSite plan required per §25.06.080.10 for all CE development [confirmed §25.02.060.2 item 5]
pedestrian_access_planRequired to connect to City sidewalk, trail, and skyway systems [confirmed §25.02.060.2 item 6]
parkingDetermined by special study per §25.05.030.5; not standard table-based [confirmed §25.02.060.2 item 8a]
design_standards_ref§25.03.190.6 Casino Entertainment (CE) Design Standards [confirmed §25.02.060.2 item 7]
dimensional_standards_refTable 25.03.040.1: min lot 2 ac, frontage 200-ft, max height 55-ft, setbacks all 0-ft, FAR 0.280 [confirmed §25.03.040.1]
HA
Historic Area District
HP
§25.02.060.3

Locally designated landmarks and historic districts within Sioux City; applies to alterations, improvements, or demolition of designated properties [confirmed §25.02.060.3 items 3, 6-7]

primary_purposePreservation and protection of historically and architecturally significant districts, sites, and landmarks [confirmed §25.02.040]
sub_districts{"HA-4": "Historic 4th Street — adaptive reuse of buildings in nationally/locally designated historic districts [confirmed §25.02.060.3 item 6a]", "HA-P": "Historic Pearl — infill and adaptive reuse in traditional downtown character near Gateway Arena and Hard Rock Hotel/Casino [confirmed §25.02.060.3 item 6b]", "HA-N": "Historic Neighborhood/Center — historic significance of individual neighborhoods or commercial centers [confirmed §25.02.060.3 item 6c]"}
certificate_of_appropriatenessRequired per §25.06.090.16 for alterations, demolitions, and improvements [confirmed §25.02.060.3 item 5a]
designation_processVia §25.06.090.18 Designation of Historic Site or District [confirmed §25.02.060.3 item 5b]
administering_bodyHistoric Preservation Commission and Historic Preservation Officer [confirmed §25.02.060.3 item 4]
design_standards_ref§25.03.190.4 Historic Area (HA) Design Standards; incorporates Historic Fourth Design Guidelines and Sioux City Historic Pearl District Design Manual [confirmed §25.02.060.3 item 10; §25.03.130]
PI
Public and Institutional District
INS
§25.02.060.4

Properties owned by City of Sioux City, Woodbury County, or State of Iowa; parks, open spaces, schools, utilities, government buildings as mapped on Official Zoning Map [confirmed §25.02.060.4 items 2-3]

primary_purposeAccommodate public, semi-public, and institutional uses most appropriate in their own district [confirmed §25.02.060.4 item 1]
development_standards_ref§25.03.040 Nonresidential and Mixed Use Development Standards and §25.03.180 Design Standards [confirmed §25.02.060.4 item 5]
FP-overlay
FEMA Floodplain / DNR Floodplain Development
FP

FEMA Special Flood Hazard Areas and DNR-regulated floodplain areas; Sioux City is located along the Missouri River and Big Sioux River

statusunder_review
noteIowa Code §455B requires DNR floodplain development permit for construction in regulated floodplains. Sioux City participates in NFIP. Specific Title 25 section number for the local floodplain overlay not retrieved in this research pass.

State preemptions

IA SF 592 (2025) — ADU By-Rightapplies
Qualifying condition
IA SF 592 applies to all Iowa cities; Sioux City is an incorporated city in Iowa. Effective 2025-07-01. Requires ADU by-right in any zone allowing single-family residential.
Source
Iowa Code §414, as amended by SF 592 (2025 Iowa Legislative Session)
Effect
ADU by-right mandate in all zones permitting single-family residential; local ADU regulations may not prohibit ADUs outright.
Iowa Code §414.1(2) — Short-Term Rental Preemption (2020)applies
Qualifying condition
Iowa Code §414.1(2) prohibits Iowa cities from banning STRs in owner-occupied or investor-owned single-family dwellings as a matter of right. Applies to all Iowa cities. Sioux City is an incorporated city in Iowa.
Source
Iowa Code §414.1(2) as amended by HF 2341 (2020)
Effect
City may not prohibit STRs as a use type in single-family residential zones; may impose limited operational standards.
Iowa Code §414.28 — Manufactured/Mobile Home Parityapplies
Qualifying condition
Iowa Code §414.28 prohibits Iowa cities from treating manufactured homes differently from site-built homes in residential zones. Applies to all Iowa cities. Title 25 §25.02.160 is the local implementation.
Source
Iowa Code §414.28
Effect
Manufactured homes on individual lots permitted in any zone permitting single-family residential.
Iowa Code Chapter 329 — Airport Hazard Zoningapplies
Qualifying condition
Iowa Code Ch. 329 requires cities with airports to adopt airport zoning regulations. Sioux City operates Siouxland Gateway Airport (KSUX). City has implemented AP District per §25.02.060.1 consistent with Ch. 329.
Source
Iowa Code Ch. 329; Title 25 §25.02.060.1
Effect
Airport hazard height restrictions and use limitations apply in AP District zones around KSUX.
Iowa Code §455B — DNR Floodplain Development Permitapplies
Qualifying condition
Iowa Code §455B.276 requires DNR permit for floodplain development. Sioux City is located along the Missouri River and Big Sioux River; substantial flood-prone areas exist. City participates in NFIP.
Source
Iowa Code §455B; FEMA NFIP records for Sioux City, IA
Effect
DNR floodplain development permit required in addition to local zoning approvals for development within regulated floodplains.
Iowa Code §461A — Sovereign Lands Permitapplies
Qualifying condition
Iowa Code §461A requires DNR permit for use or construction on sovereign lands including beds of navigable waters. Sioux City is located on the Missouri River (a federally designated navigable waterway).
Source
Iowa Code §461A; Missouri River designation as navigable waterway
Effect
Iowa DNR sovereign lands permit required for construction or encroachment on Missouri River bed or banks.
Iowa Code §161D — Loess Hills Alliance (Advisory)applies
Qualifying condition
Iowa Code §161D establishes the Loess Hills Alliance as an advisory body. Woodbury County (FIPS 19193) is geographically within the Loess Hills formation and Alliance counties. Sioux City is the county seat. Alliance is advisory only; does not preempt local zoning.
Source
Iowa Code §161D; geographic location of Woodbury County within Loess Hills region
Effect
Advisory coordination only; no binding preemption of local zoning.
Iowa Code Chapter 403 — Urban Renewal / TIF Frameworkapplies
Qualifying condition
Iowa Code Ch. 403 authorizes cities to adopt urban renewal plans with TIF. Sioux City has multiple active TIF districts. §25.01.040.4 of Title 25 requires nonconforming use provisions to apply within urban renewal areas.
Source
Iowa Code Ch. 403; Title 25 §25.01.040.4
Effect
Urban renewal plans adopted per Ch. 403 govern redevelopment within TIF areas; nonconforming use rules apply within those areas per §25.01.040.4.
Iowa Code Chapter 303 — SHPO Historic Preservation Reviewapplies
Qualifying condition
Iowa Code Ch. 303 establishes SHPO review. Section 106 of the National Historic Preservation Act requires SHPO review for federally funded projects affecting historic properties. Sioux City has HA Districts and National Register properties. SHPO review applies to federal-nexus projects.
Source
Iowa Code §303.13; 36 CFR Part 800; National Historic Preservation Act §106
Effect
SHPO review required for federally funded/permitted projects affecting eligible historic properties. Local Certificate of Appropriateness per §25.06.090.16 applies to locally designated properties.

Adopted building codes

Statewide

IBC
2024
IRC
2024
NEC
2023
IFC
2024
IECC (Residential)
2021
IECC (Commercial)
2021

Click a code label to open its state-by-state adoption atlas.

Amendment history

DateKindCitation
2021-05-22amendment effectiveOrd. 2021-0460
2015-01-01codification startOrd. 2015-0215

Quirks & notes

  • Sioux City uses a hybrid district system: new growth areas use RR/SR/GR/UR with standard neighborhood types; established neighborhoods use NC sub-districts (NC.1-NC.5) with their own dimensional table (§25.03.020.3) that differs from the growth-area standards.
  • The CE (Casino Entertainment) District is mapped only around the Hard Rock Hotel and Casino / Gateway Arena area near the Missouri River waterfront. CE requires a site plan for all development and does not use the standard parking calculation table.
  • Table 25.03.030.3A provides dimensional standards for single-family development broken down by neighborhood type (Standard, Cluster, Planned) within each residential district — so RR, SR, and GR each have up to 3 sub-rows with different lot sizes and setbacks.
  • The HA District has three sub-districts: HA-4 (Historic 4th Street), HA-P (Historic Pearl), and HA-N (neighborhood/center). HA-N has a place-specific suffix, e.g., 'HA - Rose Hill'.
  • Parking standards (Chapter 25.05-A) were not extracted in this research pass; all parking fields are marked under_review with retrieval_failure_reason.
  • Downtown Commercial (DC) dimensional standards are set in the Special District section §25.03.190, not in Table 25.03.040.1; DC uses build-to-line requirements rather than front setbacks.
  • Iowa SF 592 (2025) ADU by-right law effective 2025-07-01 supersedes any Title 25 provisions that would prohibit ADUs in single-family residential zones (AG, RR, SR, GR, UR, NC).
  • The code refers to the airport as both 'Sioux Gateway Airport' in older provisions and 'Siouxland Gateway Airport' in newer provisions; these are the same facility (ICAO: KSUX).

Massing explorer

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Sources & references

Citations
  1. [1] §25.03.030.3A
  2. [2] §25.03.030.3A
  3. [3] §25.03.030.3A
  4. [4] §25.03.030.3A
  5. [5] §25.03.030.3A
  6. [6] §25.03.030.3A
  7. [7] n
  8. [8] u
  9. [9] §25.03.030.3A
  10. [10] §25.03.030.3A
  11. [11] §25.03.030.3A
  12. [12] §25.03.030.3A
  13. [13] §25.03.030.3A
  14. [14] §25.03.030.3A
  15. [15] n
  16. [16] u
  17. [17] §25.03.030.3A
  18. [18] §25.03.030.3A
  19. [19] §25.03.030.3A
  20. [20] §25.03.030.3A
  21. [21] §25.03.030.3A
  22. [22] §25.03.030.3A
  23. [23] n
  24. [24] u
  25. [25] §25.03.030.3A
  26. [26] §25.03.030.3A
  27. [27] §25.03.030.3A
  28. [28] §25.03.030.3A
  29. [29] §25.03.030.3A
  30. [30] §25.03.030.3A
  31. [31] n
  32. [32] u
  33. [33] §25.03.030.3A
  34. [34] §25.03.030.3A
  35. [35] §25.03.030.3A
  36. [36] §25.03.030.3A
  37. [37] §25.03.030.3A
  38. [38] §25.03.030.3A
  39. [39] n
  40. [40] u
  41. [41] §25.03.020.3
  42. [42] §25.03.020.3
  43. [43] §25.03.020.3
  44. [44] §25.03.020.3
  45. [45] §25.03.020.3
  46. [46] §25.03.020.3
  47. [47] n
  48. [48] u
  49. [49] §25.03.020.3
  50. [50] §25.03.020.3
  51. [51] §25.03.020.3
  52. [52] §25.03.020.3
  53. [53] §25.03.020.3
  54. [54] §25.03.020.3
  55. [55] n
  56. [56] u
  57. [57] §25.03.020.3
  58. [58] §25.03.020.3
  59. [59] §25.03.020.3
  60. [60] §25.03.020.3
  61. [61] §25.03.020.3
  62. [62] §25.03.020.3
  63. [63] n
  64. [64] u
  65. [65] §25.03.020.3
  66. [66] §25.03.020.3
  67. [67] §25.03.020.3
  68. [68] §25.03.020.3
  69. [69] §25.03.020.3
  70. [70] §25.03.020.3
  71. [71] n
  72. [72] u
  73. [73] §25.03.020.3
  74. [74] §25.03.020.3
  75. [75] §25.03.020.3
  76. [76] §25.03.020.3
  77. [77] §25.03.020.3
  78. [78] §25.03.020.3
  79. [79] n
  80. [80] u
  81. [81] §25.03.040.1
  82. [82] §25.03.040.1
  83. [83] §25.03.040.1
  84. [84] §25.03.040.1
  85. [85] §25.03.040.1
  86. [86] §25.03.040.1
  87. [87] §25.03.040.1
  88. [88] u
  89. [89] §25.03.040.1
  90. [90] §25.03.040.1
  91. [91] §25.03.040.1
  92. [92] §25.03.040.1
  93. [93] §25.03.040.1
  94. [94] §25.03.040.1
  95. [95] §25.03.040.1
  96. [96] u
  97. [97] §25.03.040.1
  98. [98] §25.03.040.1
  99. [99] §25.03.040.1
  100. [100] §25.03.040.1
  101. [101] §25.03.040.1
  102. [102] §25.03.040.1
  103. [103] §25.03.040.1
  104. [104] u
  105. [105] i§25.03.190
  106. [106] n
  107. [107] u
  108. [108] u
  109. [109] u
  110. [110] §25.03.040.1
  111. [111] §25.03.040.1
  112. [112] §25.03.040.1
  113. [113] §25.03.040.1
  114. [114] §25.03.040.1
  115. [115] n
  116. [116] §25.03.040.1
  117. [117] u
  118. [118] §25.03.040.1
  119. [119] §25.03.040.1
  120. [120] §25.03.040.1
  121. [121] §25.03.040.1
  122. [122] §25.03.040.1
  123. [123] n
  124. [124] §25.03.040.1
  125. [125] u

Research status

Publication gates

primary url presentpassedcode_source is https://online.encodeplus.com/regs/siouxcity-ia/ — direct municipal code platform (EncodePlus), not an aggregator
no aggregator citedpassedNo Zoneomics, Steadily, SitePlanGuide, or other aggregator domain cited anywhere in this record
confidence tags full formpassedAll confirmed fields carry full-form §-section citations (e.g., c§25.03.020.3, c§25.03.030.3A, c§25.03.040.1, c§25.02.060.1); inferred fields carry basis citations; under_review fields carry both qualifying_condition_checked and retrieval_failure_reason as required by FM-8
overlays have parameters trigger confidencepassedAll 5 overlays have trigger, params, and confidence fields. AP: height limit formulas per zone type + permit requirements + airport name. CE: site plan requirement + parking special study + dimensional standards reference. HA: sub-district definitions + CoA procedure + administering body + design standards reference. PI: use category + development standards reference. FP: trigger by river location + under_review status with reason.
preempt section city specificpassedIowa is not in the Gate 5 active-preemption state list (CA/TX/FL/OR/WA/CO/MN/MT/UT/AZ/NJ/CT). However all 9 state preemption entries carry qualifying_condition_checked with city-specific evaluation language, specific Iowa Code citations, and effective dates. Iowa SF 592 ADU by-right (2025-07-01) confirmed applicable. Iowa Code §414.1(2) STR preemption confirmed applicable. Airport hazard, floodplain, and sovereign lands preemptions all evaluated with city-specific geographic facts.

Data quality

62%completeness89 confirmed4 inferred12 not found
Documented gaps
  • Parking standards (Chapter 25.05-A) not extracted — all parking fields under_review
  • DC dimensional standards (§25.03.190 DC Design Standards) not extracted — height and FAR under_review
  • UR Village and Downtown Loft sub-type dimensional standards not captured
  • RR Cluster and RR Planned sub-type standards in note only
  • SR Cluster and SR Planned sub-type standards in note only
  • GR Cluster and GR Planned sub-type standards in note only
  • FAR not found in residential district tables (not specified in §25.03.030.3A or §25.03.020.3)
  • GI maximum height not explicitly stated in Table 25.03.040.1
  • Floodplain overlay Title 25 section number not captured

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