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Midwest county atlas

Ohio county map

Explore all 88 counties. Select a county to see its map, or download a copy for your next project.

2025 Census boundaries88 mapped unitsCapital: Columbus
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Boundary map 100%
Labelled map of Ohio counties Adams CountyAllen CountyAshland CountyAshtabula CountyAthens CountyAuglaize CountyBelmont CountyBrown CountyButler CountyCarroll CountyChampaign CountyClark CountyClermont CountyClinton CountyColumbiana CountyCoshocton CountyCrawford CountyCuyahoga CountyDarke CountyDefiance CountyDelaware CountyErie CountyFairfield CountyFayette CountyFranklin CountyFulton CountyGallia CountyGeauga CountyGreene CountyGuernsey CountyHamilton CountyHancock CountyHardin CountyHarrison CountyHenry CountyHighland CountyHocking CountyHolmes CountyHuron CountyJackson CountyJefferson CountyKnox CountyLake CountyLawrence CountyLicking CountyLogan CountyLorain CountyLucas CountyMadison CountyMahoning CountyMarion CountyMedina CountyMeigs CountyMercer CountyMiami CountyMonroe CountyMontgomery CountyMorgan CountyMorrow CountyMuskingum CountyNoble CountyOttawa CountyPaulding CountyPerry CountyPickaway CountyPike CountyPortage CountyPreble CountyPutnam CountyRichland CountyRoss CountySandusky CountyScioto CountySeneca CountyShelby CountyStark CountySummit CountyTrumbull CountyTuscarawas CountyUnion CountyVan Wert CountyVinton CountyWarren CountyWashington CountyWayne CountyWilliams CountyWood CountyWyandot County
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2025 U.S. Census boundaries. Zoom to reveal more names. Drag to pan when zoomed; use arrow keys, + and − with the map focused.

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SVG

SVG is editable vector artwork. PNG is a high-resolution image. PDF uses landscape Letter pages, with a separate key when needed.

Downloads contain the complete boundary map, independent of zoom. Crowded names use a numbered key. Numbered quiz maps use the county list / answer key (CSV). Boundary data (GeoJSON) · Reuse with source credit.

Roads, terrain & aerial imagery

Explore Ohio with a county boundary overlay. Choose a view to load the interactive map.

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Street names, terrain, or aerial photography with the county boundary in view.

Backgrounds load from OpenStreetMap or USGS only when selected. Imagery dates and detail vary by location.

Map scope: Use the boundary map for names and shapes, or the interactive background viewer for roads, terrain, and aerial imagery. County boundaries do not identify parcels or ZIP codes.

Ohio county geography overview

Ohio has 88 counties, which places it 13th among the 50 state and District of Columbia maps in this atlas when ordered by number of county-level units. Their combined 40,858.7 square miles of land place the state 35th by mapped land area.

The average county-level area is 464 square miles, while the median is 436 square miles. The median is often the better description of a typical unit because one or two very large areas can pull the average upward. The five largest units together account for about 8% of the state’s mapped land area.

88county-level units
436 sq mimedian land area
702.4 sq milargest unit
9%share of mapped area that is water

Largest and smallest Ohio counties

Ashtabula County is the largest county-level unit by land area at 702.4 square miles. It represents about 2% of all mapped land in Ohio. At the other end of the range, Lake County has 229.4 square miles of land.

Largest by land area

  1. Ashtabula County702.4 sq mi
  2. Ross County689.2 sq mi
  3. Licking County682.4 sq mi
  4. Muskingum County664.5 sq mi
  5. Washington County632.2 sq mi

Smallest by land area

  1. Lake County229.4 sq mi
  2. Erie County251.3 sq mi
  3. Ottawa County254.7 sq mi
  4. Lucas County339.7 sq mi
  5. Carroll County394.7 sq mi

Rankings use land area rather than total area. This avoids making coastal or lake counties appear larger solely because their boundaries include extensive water.

Alphabetical list of Ohio counties

The table is alphabetical, so it works as a name and FIPS-code reference rather than an area ranking. Every identifier begins with the Ohio state FIPS prefix 39. Land and water figures are rounded to one decimal place.

88 county-level areas

Download county data / numbered map key (CSV)
No.NameFIPS codeLand areaWater area
1Adams County39001583.9 sq mi2.4 sq mi
2Allen County39003402.5 sq mi4.3 sq mi
3Ashland County39005423 sq mi3.8 sq mi
4Ashtabula County39007702.4 sq mi665.8 sq mi
5Athens County39009503.6 sq mi4.8 sq mi
6Auglaize County39011401.4 sq mi0.5 sq mi
7Belmont County39013532.2 sq mi9.1 sq mi
8Brown County39015489.6 sq mi3.4 sq mi
9Butler County39017466.5 sq mi3.5 sq mi
10Carroll County39019394.7 sq mi4.3 sq mi
11Champaign County39021429 sq mi0.8 sq mi
12Clark County39023395.9 sq mi5.6 sq mi
13Clermont County39025452.6 sq mi7.7 sq mi
14Clinton County39027408.7 sq mi3.6 sq mi
15Columbiana County39029531.9 sq mi2.8 sq mi
16Coshocton County39031563.9 sq mi3.5 sq mi
17Crawford County39033401.8 sq mi0.9 sq mi
18Cuyahoga County39035457.2 sq mi788.3 sq mi
19Darke County39037598.1 sq mi1.6 sq mi
20Defiance County39039411.4 sq mi2.7 sq mi
21Delaware County39041443.1 sq mi14.2 sq mi
22Erie County39043251.3 sq mi374.5 sq mi
23Fairfield County39045504.4 sq mi4.2 sq mi
24Fayette County39047406.4 sq mi0.7 sq mi
25Franklin County39049532.4 sq mi11.2 sq mi
26Fulton County39051405.4 sq mi1.8 sq mi
27Gallia County39053466.5 sq mi4.7 sq mi
28Geauga County39055400.4 sq mi8 sq mi
29Greene County39057413.6 sq mi2.6 sq mi
30Guernsey County39059522.2 sq mi6 sq mi
31Hamilton County39061405.5 sq mi7.2 sq mi
32Hancock County39063531.3 sq mi2.3 sq mi
33Hardin County39065470.3 sq mi0.2 sq mi
34Harrison County39067402.3 sq mi8.4 sq mi
35Henry County39069416 sq mi3.7 sq mi
36Highland County39071553.1 sq mi4.7 sq mi
37Hocking County39073421.3 sq mi2.3 sq mi
38Holmes County39075422.6 sq mi1.4 sq mi
39Huron County39077492.2 sq mi3.3 sq mi
40Jackson County39079420.3 sq mi1.2 sq mi
41Jefferson County39081408.1 sq mi2.8 sq mi
42Knox County39083525.5 sq mi4.1 sq mi
43Lake County39085229.4 sq mi749.9 sq mi
44Lawrence County39087453.4 sq mi3.9 sq mi
45Licking County39089682.4 sq mi4.9 sq mi
46Logan County39091458.5 sq mi8.3 sq mi
47Lorain County39093490.5 sq mi432.2 sq mi
48Lucas County39095339.7 sq mi256.2 sq mi
49Madison County39097466.7 sq mi0.8 sq mi
50Mahoning County39099411.5 sq mi13.7 sq mi
51Marion County39101403.8 sq mi0.4 sq mi
52Medina County39103421.5 sq mi1.6 sq mi
53Meigs County39105430.1 sq mi2.9 sq mi
54Mercer County39107462.4 sq mi11 sq mi
55Miami County39109406.6 sq mi3.1 sq mi
56Monroe County39111455.6 sq mi1.7 sq mi
57Montgomery County39113461.4 sq mi2.9 sq mi
58Morgan County39115416.4 sq mi5.4 sq mi
59Morrow County39117406.1 sq mi1.1 sq mi
60Muskingum County39119664.5 sq mi8 sq mi
61Noble County39121398 sq mi6.6 sq mi
62Ottawa County39123254.7 sq mi330.4 sq mi
63Paulding County39125416.4 sq mi2.4 sq mi
64Perry County39127407.9 sq mi4.5 sq mi
65Pickaway County39129501.3 sq mi5.3 sq mi
66Pike County39131440.3 sq mi3.7 sq mi
67Portage County39133487.5 sq mi16.6 sq mi
68Preble County39135424.2 sq mi2.3 sq mi
69Putnam County39137482.5 sq mi1.8 sq mi
70Richland County39139495.2 sq mi4.8 sq mi
71Ross County39141689.2 sq mi3.9 sq mi
72Sandusky County39143408.2 sq mi9.5 sq mi
73Scioto County39145610.2 sq mi6.2 sq mi
74Seneca County39147551 sq mi1.8 sq mi
75Shelby County39149407.7 sq mi3 sq mi
76Stark County39151574.9 sq mi5.3 sq mi
77Summit County39153412.7 sq mi7.3 sq mi
78Trumbull County39155617.6 sq mi18.4 sq mi
79Tuscarawas County39157567.6 sq mi4 sq mi
80Union County39159431.7 sq mi5.2 sq mi
81Van Wert County39161409.1 sq mi1.3 sq mi
82Vinton County39163412.4 sq mi2.6 sq mi
83Warren County39165401.4 sq mi6.1 sq mi
84Washington County39167632.2 sq mi8 sq mi
85Wayne County39169555 sq mi1.9 sq mi
86Williams County39171420.7 sq mi2.4 sq mi
87Wood County39173617.2 sq mi3.4 sq mi
88Wyandot County39175406.9 sq mi0.7 sq mi

How to read and use this map

County lines are administrative boundaries, not postal routes. A mailing address can use a city name associated with a neighboring area, and ZIP codes can cross county lines. When you need to identify a county for an address, confirm it with an official geocoder or local government source.

For classroom or planning use, download a PDF from the controls above. Labelled exports use numbered callouts for crowded areas; numbered quiz maps match the alphabetical county list. SVG files keep the boundary lines sharp at larger paper sizes.

Frequently asked questions

How many counties are in Ohio?

Ohio has 88 counties in the U.S. Census Bureau’s 2025 cartographic boundary file.

Can I print this Ohio county map?

Yes. Choose Download / print and select PDF for a landscape Letter page, PNG for an image, or SVG for editable vector artwork. Because the map is SVG, its boundary lines stay sharp when scaled.

What is the largest county in Ohio?

Ashtabula County is the largest by land area in this dataset at 702.4 square miles. This is an area ranking, not a population ranking.

What is the smallest county in Ohio?

Lake County is the smallest by land area in this dataset at 229.4 square miles.

Are these legal survey boundaries?

No. This is a generalized reference map. Property, parcel, election, and legal boundary questions should be checked with the relevant state or local agency.

Map source

U.S. Census Bureau, 2025 Cartographic Boundary File, Counties, 1:5,000,000. Land and water area fields are supplied in the same file and converted from square meters to square miles. Accessed September 27, 2026.