County Maps US

Miami County, Indiana

A county in Indiana, ranked 47 of 92 by population.

CountyFIPS 18103

Within Indiana
Miami County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Peru, the county seat, located via the 2025 Census Gazetteer.

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Population
34,487
-1,420 (-4.0%) since 2020
Land area
373.8
square miles. A further 0.9% of the total area is water
Population density
92.3
people per square mile, computed rather than published
County seat
Peru
Seat of county government.
Established
1832
193 years ago
Largest city
Peru city
Population 10,962.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Miami County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Miami County, Indiana from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 464 by 800 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Miami County ranks

Position among the 92 counties of Indiana, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn IndianaNationally
Population34,48747th of 921,326th of 3,144
Land area373.8 sq mi61st of 922,622nd of 3,144
Population density92.3 per sq mi44th of 92972nd of 3,144
Median household income$61,13978th of 921,976th of 3,143

Full data for Miami County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population34,487Vintage 2025 Population Estimates
Population in 202035,907Vintage 2025 Population Estimates
2020 estimates base?35,960Vintage 2025 Population Estimates
Land area373.8 sq mi2025 Gazetteer Files
Water area3.5 sq mi2025 Gazetteer Files
Total area377.4 sq mi2025 Gazetteer Files
Population density?92.3 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$61,139American Community Survey 2020-2024 5-Year Estimates
Median home value$126,200American Community Survey 2020-2024 5-Year Estimates
Median age41.5American Community Survey 2020-2024 5-Year Estimates
Households13,318American Community Survey 2020-2024 5-Year Estimates
Housing units14,952American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
-22
371 births, 393 deaths
Net migration
+43
More people moved in than moved out.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 5 areas bordering Miami County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Wabash CountyIndiana28 mi30,713
Cass CountyIndiana24 mi37,836
Fulton CountyIndiana18 mi20,091
Howard CountyIndiana16 mi83,904
Grant CountyIndiana5.9 mi66,524

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 92 counties of Indiana

Open the interactive Indiana county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.