County demographics · Ohio
Montgomery County, Ohio demographics
Montgomery County, Ohio (county FIPS 39113) has a median household income of $66,139 (±$1,144) and a total population of 536,096 in the American Community Survey 5-year estimates for 2020-2024.
Margins of error are at the 90% confidence level. The figures describe 2020-2024 (dollars in 2024 dollars), not the present. 42 ZIP Code Tabulation Areas overlap the county (Census 2020).
Data as of Oct 22, 2026 (Olympus publication) · Markdown version
- Values are ACS 5-year estimates for 2020-2024 (dollars in 2024 dollars), not current figures.
- ZCTA-county overlaps come from the Census 2020 relationship file and use 2020 counties, by land area; Connecticut uses its legacy counties, not the planning regions in ACS 2022+.
ACS 5-year estimates, 2020-2024
Census American Community Survey 5-year estimates for 2020-2024, with 90% margins of error as published by the Census Bureau.
| Metric | Estimate | Margin of error (90%) | ACS table |
|---|---|---|---|
| Total population | 536,096 | none (controlled estimate) | B01003 |
| Median age | 38.8 years | ±0.2 years | B01002 |
| Households | 231,319 | ±1,238 | B11001 |
| Median household income (inflation-adjusted to the final ACS year) | $66,139 | ±$1,144 | B19013 |
| Median value of owner-occupied housing units | $180,900 | ±$2,949 | B25077 |
| Median gross rent | $1,026 | ±$16 | B25064 |
| Owner-occupied share of occupied housing units | 62.5% | none (derived from several estimates) | B25003 (derived) |
| Renter-occupied share of occupied housing units | 37.5% | none (derived from several estimates) | B25003 (derived) |
| High school graduate or higher (age 25+) | 92.7% | none (derived from several estimates) | B15003 (derived) |
| Bachelor's degree or higher (age 25+) | 31.3% | none (derived from several estimates) | B15003 (derived) |
| Share of people below the poverty level | 15% | none (derived from several estimates) | B17001 (derived) |
| Unemployment rate (civilian labor force) | 5.7% | none (derived from several estimates) | B23025 (derived) |
- Dollar values are in 2024 inflation-adjusted dollars.
- Percentages' margins of error are in percentage points (pp).
Geography
| Measure | Value |
|---|---|
| County FIPS | 39113 |
| Land area | 461.35 sq mi |
| Water area | 2.89 sq mi |
| Population density | 1,162 per sq mi of land |
| Geography vintage | 2024 Gazetteer |
ZIP codes (ZCTAs) in this county
ZCTAs that overlap the county in the Census 2020 ZCTA to county relationship file, largest share of the county's land first.
| ZCTA | Share of county land | Share of ZCTA land | County is the ZCTA's primary county |
|---|---|---|---|
| 45309 | 13.5% | 94.7% | Yes |
| 45327 | 9.8% | 94.2% | Yes |
| 45342 | 7.3% | 98.4% | Yes |
| 45417 | 7% | 100% | Yes |
| 45424 | 5.8% | 84.7% | Yes |
| 45325 | 5.6% | 100% | Yes |
| 45345 | 4.8% | 100% | Yes |
| 45414 | 4.7% | 100% | Yes |
| 45377 | 4.6% | 100% | Yes |
| 45426 | 4.3% | 100% | Yes |
| 45322 | 3.6% | 77.5% | Yes |
| 45458 | 3.5% | 82.3% | Yes |
| 45459 | 3% | 96.7% | Yes |
| 45315 | 2.4% | 100% | Yes |
| 45429 | 2.1% | 100% | Yes |
| 45439 | 1.7% | 100% | Yes |
| 45404 | 1.6% | 100% | Yes |
| 45449 | 1.5% | 100% | Yes |
| 45420 | 1.4% | 100% | Yes |
| 45415 | 1.3% | 100% | Yes |
| 45381 | 1.1% | 9.3% | |
| 45406 | 1.1% | 100% | Yes |
| 45431 | 1% | 38.3% | |
| 45402 | 0.9% | 100% | Yes |
| 45405 | 0.9% | 100% | Yes |
| 45419 | 0.8% | 100% | Yes |
| 45409 | 0.8% | 100% | Yes |
| 45440 | 0.7% | 36.2% | |
| 45403 | 0.7% | 100% | Yes |
| 45410 | 0.5% | 100% | Yes |
| 45432 | 0.5% | 33.6% | |
| 45371 | 0.5% | 4.3% | |
| 45416 | 0.4% | 100% | Yes |
| 45354 | 0.2% | 100% | Yes |
| 45428 | 0.1% | 100% | Yes |
| 45042 | 0.1% | 0.9% | |
| 45005 | 0% | 0.6% | |
| 45066 | 0% | 1% | |
| 45344 | 0% | 0.2% | |
| 45378 | 0% | 19.8% | |
| 45469 | 0% | 100% | Yes |
| 45423 | 0% | 100% | Yes |
Sources
- American Community Survey 5-year estimates (Census Data API) — U.S. Census Bureau. ACS 5-year 2020-2024 (release acs5-2024:county), source date 2025-09-02. https://api.census.gov/data/2024/acs/acs5?get=NAME,B01003_001E,B01003_001M,B01002_001E,B01002_001M,B11001_001E,B11001_001M,B19013_001E,B19013_001M,B25077_001E,B25077_001M,B25064_001E,B25064_001M,B25003_001E,B25003_002E,B25003_003E,B15003_001E,B15003_017E,B15003_018E,B15003_019E,B15003_020E,B15003_021E,B15003_022E,B15003_023E,B15003_024E,B15003_025E,B17001_001E,B17001_002E,B23025_003E,B23025_005E&for=county:113&in=state:39
- Published by Olympus on Oct 22, 2026.
- Source data: U.S. Census Bureau. Works of the U.S. government are not subject to copyright in the United States.
- This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.
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The same figures, with provenance on every value, from the API (free API key, reference) or from an AI agent through the Olympus MCP server.
curl -s "https://api.olympus.new-odyssey.com/v1/geo-demographics/counties/39113" -H "X-API-Key: $OLYMPUS_API_KEY"get_us_demographics {"county_fips":"39113"}