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Union, Ohio
Union Municipal Building
Union Municipal Building
Official seal of Union, Ohio
Location in Montgomery County and the state of Ohio.
Location in Montgomery County and the state of Ohio.
Country United States
State Ohio
Counties Montgomery, Miami
Founded 1806
Named "Union" in 1816
Incorporated 1982 (as city)
 • Total 8.62 sq mi (22.32 km2)
 • Land 8.54 sq mi (22.12 km2)
 • Water 0.08 sq mi (0.20 km2)
922 ft (281 m)
 • Total 6,419
 • Estimate 
 • Density 806.72/sq mi (311.48/km2)
Time zone UTC-5 (EST)
 • Summer (DST) UTC-4 (EDT)
ZIP code
45322 and 45377
Area code(s) 937, 326
FIPS code 39-78470
GNIS feature ID 1049256

Union is a city in Montgomery and Miami Counties in the U.S. state of Ohio. The population was 6,419 at the 2010 census. It is part of the Dayton Metropolitan Statistical Area.


The coordinates for The City of Union are 39°54′1″N 84°18′49″W / 39.90028°N 84.31361°W / 39.90028; -84.31361 (39.900154, -84.313494).

According to the United States Census Bureau, the city has a total area of 7.13 square miles (18.47 km2), of which 7.05 square miles (18.26 km2) is land and 0.08 square miles (0.21 km2) is water. The Stillwater River runs on its east side.

Ironically, Union lies west of West Union, Ohio, the county seat of Adams County approximately 60 miles east of Cincinnati. Union and West Union are not adjacent to each other, actually being approximately 120 miles from each other.


One major state highway, State Route 48, runs North and South through Union. In Union, State Route 48 is known as Main Street. Union is 4 miles North of Interstate 70

Other notable streets in Union include Martindale Road, Sweet Potato Ridge Road, and Phillipsburg-Union Road.


Historical population
Census Pop.
1880 224
1930 263
1940 280 6.5%
1950 370 32.1%
1960 1,072 189.7%
1970 3,654 240.9%
1980 5,219 42.8%
1990 5,501 5.4%
2000 5,574 1.3%
2010 6,419 15.2%
2019 (est.) 6,891 7.4%

2010 census

As of the census of 2010, there were 6,419 people, 2,554 households, and 1,811 families living in the city. The population density was 910.5 inhabitants per square mile (351.5/km2). There were 2,721 housing units at an average density of 386.0 per square mile (149.0/km2). The racial makeup of the city was 93.5% White, 3.6% African American, 0.2% Native American, 0.7% Asian, 0.2% from other races, and 1.8% from two or more races. Hispanic or Latino of any race were 1.6% of the population.

There were 2,554 households, of which 35.0% had children under the age of 18 living with them, 54.9% were married couples living together, 12.0% had a female householder with no husband present, 4.0% had a male householder with no wife present, and 29.1% were non-families. 24.3% of all households were made up of individuals, and 9.2% had someone living alone who was 65 years of age or older. The average household size was 2.51 and the average family size was 2.99.

The median age in the city was 38.6 years. 25.5% of residents were under the age of 18; 6.8% were between the ages of 18 and 24; 26.8% were from 25 to 44; 28.1% were from 45 to 64; and 12.8% were 65 years of age or older. The gender makeup of the city was 48.1% male and 51.9% female.


Union residents west of the Stillwater River are served by the Northmont City School District of Montgomery County. The schools that Union children attend include:

  • Northmont High School
  • Northmont Middle School
  • Union Elementary

East of the Stillwater River, students attend Vandalia-Butler City School District.

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