What is the largest city in Miami County, OH?

Troy is the largest city or town in Miami County, with about 26,842 residents.

How many ZIP codes are in Miami County?

Miami County includes 12 ZIP Code Tabulation Areas, including 45312, 45317, 45318, 45326, 45337.

What is the population of Miami County, OH?

About 110,296 people live in Miami County, based on American Community Survey 5-year estimates.

What counties border Miami County?

Miami County borders Montgomery County, Clark County, Darke County, Shelby County, Champaign County.

Miami County, OH: Cities, ZIP Codes & Local Data

Population

110,296

Land area

407sq mi

People per sq mi

271

ZIP codes

12

Miami County at a glance

The median household income is $76,817, 8% above the Ohio median of $71,389.
A typical owner-occupied home is valued at $229,100 (7% above Ohio) and median rent is $966 a month.
Its largest cities are Troy (26,842), Piqua (20,646) and Tipp City (10,439).

Local data for Miami County, OH

Counts from official public data

Housing and community stats

Miami County, OH, American Community Survey 2020-2024

Full profile

Median household income

$76,817

Poverty rate

9.4%

Median home value

$229,100

Prices +4.0% in a year

Median rent

$966/mo

Homeownership

73.4%

Bachelor's or higher

26.8%

Median age

41.3

Average commute

22.0 min

Largest reported origins and ancestries: German Americans (30,779), Irish Americans (13,297), French Americans (3,318).

Home values and rents Income, education and commute

Economy and federal money

Jobs, income, federal spending and pandemic loans

Details

Unemployment rate

3.2%

Sep 2026, -0.6 pts in a year

Average annual pay

$57,484

41,783 jobs, 2025

Income per person

$62,303

BEA, 2024

Federal spending

$784M

FY 2026, $7,208 per person

PPP loans

$213M

2,425 loans, 23,285 jobs reported

Campaign donations

$426K

Itemized, 2026 cycle

Economy Federal spending PPP loans

How people get to work

Miami County, OH, workers 16 and older. American Community Survey 5-year estimates

Drove alone80.3%
Carpooled6.3%
Public transit0.2%
Walked1.6%
Bicycle0.4%
Taxi, ride-hailing, motorcycle or other1.2%
Worked from home10.2%

Average one-way commute: 22.0 minutes for people who do not work from home.

Environment and hazard risk

Miami County, OH, from FEMA, NOAA and EPA

Full report

Natural hazard risk

Relatively Low

Top: earthquake

Storm events since 1996

512

Most often thunderstorm wind

Flood insurance policies

268

0.7% of homes, county

July high / Jan low

84° / 21°F

40.7 inches of rain a year

Hazards, floods and storm history Check a flood zone 36 historic places

Health statistics

Share of adults in Miami County, OH, CDC PLACES estimates

All 40 measures

Obesity

33.6%

U.S. 33.3% about the same

Diabetes

12.7%

U.S. 12.1% +0.6 pts

Smoking

15.3%

U.S. 12.8% +2.5 pts

Uninsured (18-64)

7.2%

U.S. 11.1% -3.9 pts

Cities, towns and ZIP codes in Miami County

Population shown

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Frequently asked questions

What is the largest city in Miami County, OH?: Troy is the largest city or town in Miami County, with about 26,842 residents.
How many ZIP codes are in Miami County?: Miami County includes 12 ZIP Code Tabulation Areas, including 45312, 45317, 45318, 45326, 45337.
What is the population of Miami County, OH?: About 110,296 people live in Miami County, based on American Community Survey 5-year estimates.
What counties border Miami County?: Miami County borders Montgomery County, Clark County, Darke County, Shelby County, Champaign County.