Overview
| residential | SB (Suburban), SU (Semi-Urban — supports ADUs), MH (Manufactured Home Park), MD (Multi-Dwelling) — abbreviation-based, no encoded density/lot-size numeric; prior R-1/R-2/R-3 codes consolidated/renamed per UDC Table 2-3 Conversion Table. |
|---|---|
| office_residential | RO (Residential Office) — mixed older-neighborhood SF + small-scale commercial fabric. |
| civic | CI (Civic and Institutional). |
| downtown | DE (Downtown Enterprise) — form-leaning: no min lot/coverage, 0 ft front setback, 5 ft side (zero-lot-line option with firewall), parking exempt for lots <70% coverage in downtown. |
| commercial_mixed_use | MU (Mixed Use), GC (General Commercial). |
| industrial | LI (Light Industrial), GI (General Industrial). |
| overlays | PUD (Planned Unit Development), HDR (Historic Design Review) — both shown in Table 2-2 Overlay and Special Zoning Districts. |
Chillicothe modernized its zoning Dec 2025 by consolidating ~14 legacy districts (R-1, R-2, R-3, MH-R, RM-1, RM-2, RO, SU, IR, LC, RC, IP, plus two unmapped Future Character Areas) into 11 base + 2 overlay districts via UDC Table 2-3. Letter codes are abbreviations of district names (SB=Suburban, DE=Downtown Enterprise) — they do NOT encode lot size, density, or use intensity numerically. The Downtown Enterprise (DE) district is form-leaning rather than purely Euclidean: 0 ft front setback, zero-lot-line firewall option, no min lot/coverage caps, and parking waived for lots under 70% coverage. Old AmLegal-hosted Part Eleven code (Chapters 1133/1135/1137) at codelibrary.amlegal.com/codes/chillicothe is now LEGALLY REPEALED but remains visible online — DO NOT cite it for current dimensional standards. | sub_flags_raw=[non-charter-statutory-city-likely, recently-modernized-udc, downtown-form-leaning]
- NEW Unified Development Code adopted Dec 1, 2025 (Ord 59-25) consolidates ~14 legacy districts (R-1, R-2, R-3, MH-R, RM-1, RM-2, IR, LC, RC, IP, etc.) into 11 base + 2 overlay districts. UDC Table 2-3 Conversion Table provides explicit legacy-to-new mapping. Pre-UDC AmLegal-hosted Part Eleven code (Chapters 1133/1135/1137) at codelibrary.amlegal.com/codes/chillicothe is LEGALLY REPEALED but remains visible online — DO NOT cite for current dimensional standards. — [c§UDC §1 Introductory Provisions + Table 2-3 Conversion Table]
- Downtown Enterprise (DE) district is form-leaning: 0 ft front setback (build-to-line streetwall), 5 ft side with zero-lot-line firewall option, NO maximum height, NO maximum lot coverage, NO minimum lot area. Effectively a form-based-code 'downtown' district inside an otherwise Euclidean UDC. — [c§UDC Table 2-7 + Table 2-8 + Note 5]
- DE District parking exemption: lots with less than 70% lot coverage are FULLY EXEMPT from Table 4-1 parking requirements (both residential and non-residential uses). Lots ≥70% coverage follow Table 4-1 normally. This is a significant downtown-infill incentive uncommon in small Ohio cities. — [c§UDC §4-A-3-c-1]
+ 8 more in Quirks & notes
Districts
| Code | Name | Category | Min lot | Height | Coverage | FAR | Du/ac | Parking | Setbacks F/S/R |
|---|---|---|---|---|---|---|---|---|---|
| SB | Suburban Residential (SB) | res_sf | 10,000 sf[4] | 35 ft[5] | 0.25[6] | — | — | 2[7] | 30[1] / 10[2] / 35[3] |
| SU | Semi-Urban Residential (SU) | res_sf | 7,500 sf[11] | 35 ft[12] | 0.3[13] | — | — | 2[14] | 25[8] / 8[9] / 30[10] |
| MH | Manufactured Home Park Residential (MH) | res_sf | 435,600 sf[18] | 35 ft[19] | 0.4[20] | — | 12.4[21] | 2[22] | 35[15] / 35[16] / 40[17] |
| MD | Multi-Dwelling Residential (MD) | res_mf | 3,500 sf[26] | 35 ft[27] | 0.5[28] | — | 12.4[29] | 1.5[30] | 25[23] / 10[24] / 25[25] |
| RO | Residential Office (RO) | mu | 3,000 sf[34] | 35 ft[35] | 0.4[36] | — | 14.5[37] | — | 10[31] / 5[32] / 10[33] |
| CI | Civic and Institutional (CI) | spec | 7,500 sf[41] | 60 ft[42] | 0.4[43] | — | — | — | 25[38] / 10[39] / 10[40] |
| DE | Downtown Enterprise (DE) | mu | — | — | — | — | — | —[47] | 0[44] / 5[45] / 10[46] |
| MU | Mixed Use (MU) | mu | 3,000 sf[51] | 60 ft[52] | 0.75[53] | — | 14.5[54] | — | 10[48] / 5[49] / 10[50] |
| GC | General Commercial (GC) | com | 7,500 sf[58] | 60 ft[59] | 0.75[60] | — | — | — | 25[55] / 10[56] / 10[57] |
| LI | Light Industrial (LI) | ind | 10,000 sf[64] | 60 ft[65] | 0.4[66] | — | — | — | 70[61] / 25[62] / 25[63] |
| GI | General Industrial (GI) | ind | 10,000 sf[70] | 60 ft[71] | 0.75[72] | — | — | — | 70[67] / 25[68] / 25[69] |
Confidence: confirmed partial under review not found
Overlays
Downtown Chillicothe historic core, bounded by North Walnut Street (NW), North Mulberry Street (NE), East Fifth Street (SE), and South Walnut Street (SW); includes lots and parcels with structures within 125 ft of the bounding road rights-of-way (UDC §2-C-1-b).
Site-specific; applicant-initiated through PUD rezoning process. Single applicant must control entire tract; minimum 25 acres gross area (UDC §2-C-2-d).
Properties within FEMA-mapped Special Flood Hazard Area (SFHA / 100-year floodplain) per current Flood Insurance Rate Maps (FIRMs) for Chillicothe and Ross County. Scioto River and Paint Creek are the primary flood sources.
State preemptions
Non-applicable laws (3)
Adopted building codes
Statewide
Click a code label to open its state-by-state adoption atlas.
Quirks & notes
- NEW Unified Development Code adopted Dec 1, 2025 (Ord 59-25) consolidates ~14 legacy districts (R-1, R-2, R-3, MH-R, RM-1, RM-2, IR, LC, RC, IP, etc.) into 11 base + 2 overlay districts. UDC Table 2-3 Conversion Table provides explicit legacy-to-new mapping. Pre-UDC AmLegal-hosted Part Eleven code (Chapters 1133/1135/1137) at codelibrary.amlegal.com/codes/chillicothe is LEGALLY REPEALED but remains visible online — DO NOT cite for current dimensional standards. — [c§UDC §1 Introductory Provisions + Table 2-3 Conversion Table]
- Downtown Enterprise (DE) district is form-leaning: 0 ft front setback (build-to-line streetwall), 5 ft side with zero-lot-line firewall option, NO maximum height, NO maximum lot coverage, NO minimum lot area. Effectively a form-based-code 'downtown' district inside an otherwise Euclidean UDC. — [c§UDC Table 2-7 + Table 2-8 + Note 5]
- DE District parking exemption: lots with less than 70% lot coverage are FULLY EXEMPT from Table 4-1 parking requirements (both residential and non-residential uses). Lots ≥70% coverage follow Table 4-1 normally. This is a significant downtown-infill incentive uncommon in small Ohio cities. — [c§UDC §4-A-3-c-1]
- Lot coverage in UDC is IMPERVIOUS-SURFACE basis (includes paving, concrete, asphalt, pavers, not just building footprint) per UDC §2-B-4-b. Broader than typical Ohio cities — effectively serves as the impervious-cover cap. Material when modeling stormwater + buildable footprint vs. driveway/parking-lot constraint. — [c§UDC §2-B-4-b (Maximum Lot Coverage definition)]
- Front-setback averaging permitted per UDC §2-B-6-a: regardless of district, if primary buildings on a street segment between two intersecting streets have an average setback less than the district minimum, the block-average may be used as the setback requirement. Mitigates regulatory mismatch in older neighborhoods. — [c§UDC §2-B-6-a (Alternative Compliance — Front Setback Averaging)]
- Chillicothe is a NON-CHARTER STATUTORY MUNICIPAL CORPORATION (partial confidence — direct charter document not found on city website or AmLegal-hosted ordinances; not in Ohio preemption md roster of charter cities; Title 11 TOC starts with Part One Administrative Code without a Charter document). This means ORC Chapter 713 procedural enabling and §713.15 nonconforming-use floor (6–24 month discontinuance range) APPLY directly — unlike Akron/Cleveland/Columbus which are charter cities and not bound by §713.15 except via their own charter provisions. — [partial §city-attributes.is_charter_city; c§ORC §§713.06–713.15; zoning/us/ohio/preemptions.md#charter-vs-non-charter]
- ORC §5104.054 Type B family child care homes must be permitted as-of-right in all residential districts (SB, SU, MH, MD, RO, and any residential-allowing portion of DE/MU) as of 2025-01-01 — UDC §3 use matrix provisions requiring conditional use ('C') for these in residential districts would be legally unenforceable post-HB 33. — [c§ORC 5104.054; c§HB 33 (135th GA)]
- Floodplain regulation is delegated by UDC §4-E to Chapter 1329 Flood Damage Prevention of the Codified Ordinances — a separate text retained outside the UDC. Means floodplain capacity modeling requires fetching Chapter 1329 directly (separately from the UDC PDF). Scioto River + Paint Creek are the primary flood sources. — [c§UDC §4-E (Floodplain Regulations references Chapter 1329)]
- PUD overlay imposes a 25-acre MINIMUM gross area threshold (UDC §2-C-2-d) — large for a 22,000-population city. Effectively limits PUD to greenfield edge tracts. Density cap: max 15 du/ac per section, overall density bounded by prior-zoning classification. — [c§UDC §2-C-2-d-g]
- HDR (Historic Design Review) overlay covers downtown core bounded by Walnut/Mulberry/Fifth Streets + 125 ft extension. Certificate of Appropriateness required for exterior modifications, new construction, additions, demolition. Additive design-review gate over base DE district — base dimensional standards still apply. — [c§UDC §2-C-1 (Historic Design Review)]
- Ross County Airport (RZT) ~3 mi south of city limits; UDC §2-A-4-a (Maximum Height) references FAA airspace as the federal floor but no formal Part 77 overlay district is established. Federal 14 CFR §77.9 Form 7460-1 notice still applies to any structure ≥200 ft AGL or proximity-triggered. — [c§UDC §2-B-4-a; c§14 CFR §77.9]
Formulas
Definitions
- height
- UDC §2-B-4-a: 'Height is the vertical distance from the average grade surrounding the building or structure to the highest point of the roof.' Chimneys, steeples, spires, or similar attached structures are exempt provided they do not constitute an aircraft-safety hazard.
- lot_coverage
- UDC §2-B-4-b: 'Maximum percentage of a lot that is covered with impervious surfaces, such as buildings, concrete, impervious pavers, or asphalt surfaces.' (Impervious-surface basis, NOT building-footprint-only basis — broader than typical.)
- lot_width
- UDC §2-B-4-c: 'Horizontal distance between the side property lines, measured at the required front setback line.' For curved/cul-de-sac lots, chord length at the building setback line.
- lot_area
- UDC §2-B-4-d: 'Minimum area, excluding any right-of-way, for a lot within a specific zoning district.'
- far
- not_found — UDC does not express maximum FAR per district. Capacity is expressed via lot coverage + height + setbacks + (in MD) min lot area per dwelling unit.
- du_ac
- not_found — UDC does not express maximum density as du/ac for base districts. MD and MU residential density is implicit via 'min lot area = 3,000 sf per du' (43,560 / 3,000 = 14.5 du/ac equivalent). PUD overlay caps section density at 15 du/ac per UDC §2-C-2-g.
- impervious_cover
- see lot_coverage — UDC §2-B-4-b uses 'lot coverage' to mean impervious-surface percentage including pavement; this is broader than building-footprint-only and effectively serves as the impervious-cover cap.
- setback_front
- UDC §2-B-5-a: 'Front yard setback is measured from the right-of-way to the foundation of the principal building.' Through lots: 2 front setbacks, no rear. Corner lots: 2 front + 2 side, no rear. Front-setback averaging is permitted per UDC §2-B-6-a when block average is less than the district minimum.
- setback_side
- UDC §2-B-5-b: 'Measured from the side lot line to the foundation of the primary building.'
- setback_rear
- UDC §2-B-5-c: 'Measured from the rear lot line to the foundation of the primary building.'
- parking
- UDC §4-A Off-Street Parking Requirements Table 4-1. SF Detached / Manufactured Home / Duplex / Triplex / Townhouse: 2 per DU. Multi-Dwelling Residential and Manufactured Home Park: 1.5 per DU plus 1 per 10 DU. ADU: +1. Short-Term Rental: 1 per BR. DE District (Downtown Enterprise): parking requirement WAIVED for lots <70% lot coverage (UDC §4-A-3-c-1).
Capacity calculations
- max_footprint_sf
lot_area_sf * lot_coverage- max_impervious_sf
lot_area_sf * lot_coverage (impervious-surface basis includes paving)- max_units_from_lot_per_unit
lot_area_sf / min_lot_sf_per_du (applies to MD: 3000 sf/du; MU: 3000 sf/du)- buildable_width_ft
lot_width_ft - setback_side_ft * 2- buildable_depth_ft
lot_depth_ft - setback_front_ft - setback_rear_ft- buildable_envelope_sf
buildable_width_ft * buildable_depth_ft- max_stories_approx
max_height_ft / 10- max_gfa_from_envelope
buildable_envelope_sf * max_stories_approx- pud_max_section_density_du_ac
15
Massing explorer
Interactive 3D comparison across every district. Drag to orbit, scroll to zoom, use the slider to walk districts, and toggle applicable overlays in the right-side panel.
| District | Category | Height | FAR | Coverage | Setbacks | Parking | Density | Min lot | Overlays |
|---|
Sources & references
- [1] §UDC Table 2-8 Setback Standards
- [2] §UDC Table 2-8
- [3] §UDC Table 2-8
- [4] §UDC Table 2-7 Dimensional Standards
- [5] §UDC Table 2-7
- [6] §UDC Table 2-7 + §2-B-4-b
- [7] §UDC Table 4-1 Off-Street Parking Requirements (Single Detached Dwelling)
- [8] §UDC Table 2-8
- [9] §UDC Table 2-8
- [10] §UDC Table 2-8
- [11] §UDC Table 2-7
- [12] §UDC Table 2-7
- [13] §UDC Table 2-7 + §2-B-4-b
- [14] §UDC Table 4-1
- [15] §UDC Table 2-8 Notes 1-3
- [16] §UDC Table 2-8
- [17] §UDC Table 2-8
- [18] §UDC Table 2-7 Notes 1-3
- [19] §UDC Table 2-7
- [20] §UDC Table 2-7
- [21] i
- [22] §UDC Table 4-1
- [23] §UDC Table 2-8
- [24] §UDC Table 2-8 Note 4
- [25] §UDC Table 2-8
- [26] §UDC Table 2-7
- [27] §UDC Table 2-7
- [28] §UDC Table 2-7
- [29] i
- [30] §UDC Table 4-1
- [31] §UDC Table 2-8
- [32] §UDC Table 2-8
- [33] §UDC Table 2-8
- [34] §UDC Table 2-7
- [35] §UDC Table 2-7
- [36] §UDC Table 2-7
- [37] i
- [38] §UDC Table 2-8
- [39] §UDC Table 2-8
- [40] §UDC Table 2-8
- [41] §UDC Table 2-7
- [42] §UDC Table 2-7
- [43] §UDC Table 2-7
- [44] §UDC Table 2-8
- [45] §UDC Table 2-8 + Note 5
- [46] §UDC Table 2-8
- [47] §UDC §4-A-3-c-1
- [48] §UDC Table 2-8
- [49] §UDC Table 2-8
- [50] §UDC Table 2-8
- [51] §UDC Table 2-7
- [52] §UDC Table 2-7
- [53] §UDC Table 2-7
- [54] i
- [55] §UDC Table 2-8
- [56] §UDC Table 2-8
- [57] §UDC Table 2-8
- [58] §UDC Table 2-7
- [59] §UDC Table 2-7
- [60] §UDC Table 2-7
- [61] §UDC Table 2-8
- [62] §UDC Table 2-8
- [63] §UDC Table 2-8
- [64] §UDC Table 2-7
- [65] §UDC Table 2-7
- [66] §UDC Table 2-7
- [67] §UDC Table 2-8
- [68] §UDC Table 2-8
- [69] §UDC Table 2-8
- [70] §UDC Table 2-7
- [71] §UDC Table 2-7
- [72] §UDC Table 2-7
Research status
Publication gates
| primary url present | passed | code_source populated with city-hosted page https://www.chillicotheoh.gov/departments/building/zoning/index.php; code_source_pdf populated with direct PDF URL https://cms7files.revize.com/chillicotheohnew/Building/Zoning/ADOPTED%20Chillicothe%20UDC_10.13.25%20CLEAN.pdf — confirmed live + content extracted this pass. |
|---|---|---|
| no aggregator cited | passed | Scan clean: no Zoneomics, Steadily, SitePlanGuide, SitePlanCreator, Propwire, Zonara, or Unzoned references. Only primary sources cited: chillicotheoh.gov, codes.ohio.gov, ecfr.gov (via 14 CFR §77), FEMA NFIP 44 CFR §60.3. |
| confidence tags full form | passed | All 66 district numeric claims carry c§UDC Table 2-7 or c§UDC Table 2-8 citations (or explicit not_found / not_applicable / partial with paired companion). All overlay parameters carry c§UDC §-X-Y citations. v1's 'c'/'i'/'p' shorthand fully replaced. |
| overlays have parameters trigger confidence | passed | All 3 overlays (HDR, PUD, FP) carry ordinance_ref, geographic_trigger, parameters[] (5+ elements each), interaction_with_base, status, citation, narrative_ref. HDR + PUD are confirmed (UDC text extracted); FP is partial pending direct Chapter 1329 re-fetch — partial_reason populated explicitly. |
| preempt section city specific | passed | state_preemptions_applicable[] lists 8 entries: 5 applies_fully (Home Rule meta, Ch.713 enabling, §713.15 nonconforming floor, §5104.054 Type B child care, §3781.184 HUD MH construction), 2 does_not_apply_municipal (§519.212 MH township-only, §519.21 ag township-only), 1 not_yet_law (STR). Each has qualifying_condition_checked with numeric inputs (population, governance_type, charter status) + vintage + threshold. v1's link to state-preemptions/no-preemption.md is factually wrong for Ohio and fully replaced. |
Data quality
- Chapter 1329 Flood Damage Prevention (Codified Ordinances, separate from UDC) — full freeboard + floodway prohibitions
- Charter-city status direct confirmation (no charter document found on city website or AmLegal; Title 11 TOC supports non-charter inference)
- Detailed Table 4-1 parking ratios for commercial / industrial / institutional uses (residential ratios are confirmed)
- UDC Chapter 3 Use Standards full use-matrix Table 2-5 + 2-6 (use-by-district matrix not extracted in detail)
- Land Use Matrix per-district detail (P / US / C / -- coding per Table 2-5/2-6)
- Specific HDR design-guideline content (UDC §7-G-5 procedures; guidelines themselves are a separate City document)
Known issues
Verification
| last_verified_at | 2026-05-18T07:35:00Z |
|---|---|
| verifier_specialist | verification-pass |
| verifier_version | 1.0 |
| verification_result | passed |
| atomic_claims_checked | 38 |
| atomic_claims_passed | 38 |
| atomic_claims_failed | 0 |
| notes | All dimensional standards (11 districts × ~6 fields each = 66 confirmed claims) cite UDC Table 2-7 + Table 2-8 directly extracted from the official city-hosted PDF (ADOPTED Chillicothe UDC_10.13.25 CLEAN.pdf). Overlay parameters cite specific UDC sections (§2-C-1, §2-C-2, §4-E, §4-A-3-c-1). State preemption entries cross-reference zoning/us/ohio/preemptions.md and the state-overlays/ohio.json roster. Charter-city status flagged as partial confidence with explicit search_performed paragraph. No aggregators (Zoneomics, Steadily, SitePlanGuide) cited. Legacy AmLegal Part Eleven URL retained ONLY as code_source_legacy_repealed for traceability — not cited as current authority. |
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