What city is ZIP code 45142?

ZIP code 45142 is in St. Martin, OH (Highland County).

What county is ZIP code 45142 in?

ZIP code 45142 is mostly in Highland County, Ohio.

How many people live in ZIP code 45142?

About 4,187 people live in the 45142 ZIP Code Tabulation Area, based on American Community Survey 5-year estimates.

Checked Oct 26, 2026

ZIP Code 45142

St. Martin, OH, Highland County

Population

4,187

Land area

61.8sq mi

People per sq mi

City

St. Martin

ZIP 45142 and nearby ZIP codes

Full map

ZIP 45142 at a glance

ZIP 45142 (St. Martin) is 77% less dense than Ohio as a whole.
The median household income is $66,844, 6% below the Ohio median of $71,389.
A typical owner-occupied home is valued at $167,100 (22% below Ohio) and median rent is $789 a month.

Local data for ZIP 45142

Counts from official public data

Housing and community stats

ZIP 45142, American Community Survey 2020-2024

Full profile

Median household income

$66,844

Poverty rate

7.3%

Median home value

$167,100

Prices +4.8% in a year

Median rent

$789/mo

Homeownership

81.8%

Bachelor's or higher

9.8%

Median age

37.0

Average commute

33.6 min

Income, education and commute

Economy and federal money

Businesses, pandemic loans and political donations

Details

Business establishments

ZIP Business Patterns 2023

Employees

173

$5.2M annual payroll

PPP loans

$2.6M

106 loans

Campaign donations

$2,520

0% D, 42% R, 2026 cycle

PPP loans in this ZIP

Environment and hazard risk

ZIP 45142, from FEMA, NOAA and EPA

Full report

Natural hazard risk

Relatively Low

Top: drought

Storm events since 1996

521

Countywide, mostly thunderstorm wind

Flood insurance policies

0.0% of homes, county

July high / Jan low

85° / 19°F

46.7 inches of rain a year

Hazards, floods and storm history Check a flood zone

Health statistics

Share of adults in ZIP 45142, CDC PLACES estimates

All 40 measures

Obesity

39.8%

U.S. 33.3% +6.5 pts

Diabetes

12.8%

U.S. 12.1% +0.7 pts

Smoking

17.9%

U.S. 12.8% +5.1 pts

Uninsured (18-64)

7.9%

U.S. 11.1% -3.2 pts

Frequently asked questions

What city is ZIP code 45142?: ZIP code 45142 is in St. Martin, OH (Highland County).
What county is ZIP code 45142 in?: ZIP code 45142 is mostly in Highland County, Ohio.
How many people live in ZIP code 45142?: About 4,187 people live in the 45142 ZIP Code Tabulation Area, based on American Community Survey 5-year estimates.

Source: U.S. Census Bureau (ZIP Code Tabulation Areas, American Community Survey) · Data as of 12/31/2023. ZIP Code Tabulation Areas closely match, but are not identical to, USPS ZIP code delivery areas.