ZIP Code 45142 — St. Martin CDP, OH Demographics & Data

ZIP code 45142 covers St. Martin, OH in Highland County with a population of about 4,095.

At a glance, the area shows median age of 40.4 versus a U.S. median of about 38.9.

It sits in telephone area codes 326, 937; U.S. House district OH-2; the CINCINNATI media market.

Median household income in ZIP 45142 is about $64,216 — about 15% below the U.S. median ($75,149).

On socioeconomic markers, US5 shows a poverty rate of 6.3%; unemployment rate near 5.6%; 12.8% of adults with a bachelor’s degree or higher (about 20.9 points below the national share (33.7%)).

Labor and commute patterns include leading industry context around Manufacturing, Transportation, and Retail trade; about 9.5% of workers reporting work-from-home (about 5.7 points below the U.S. share (15.2%)); a mean commute of about 180.0 minutes (U.S. average near 26.8).

Median home value is about $176,000 — about 49% below the U.S. median home value ($348,079).

Housing tenure and rents show median gross rent around $534 (about 54% below the U.S. median rent ($1,163)), and owner-occupancy near 81.1% (about 15.7 points above the national owner-occupancy rate (65.4%)).

To comfortably buy a median-priced home in ZIP 45142 in St. Martin, OH, a household would need roughly $48,000 in annual income under a 20% down, 30-year loan at 6.8% (illustrative), keeping housing costs near 28% of income. Estimated monthly PITI is about $1,131. That sits below the local median household income ($64,216), suggesting the typical household income is closer to a workable buy-in level under these assumptions. Rates, taxes, insurance, and HOA fees vary — treat this as a planning estimate, not a lender quote.

FEMA’s National Risk Index rates natural-hazard risk for St. Martin CDP, OH as Relatively Low (composite score 43.2), which is near the middle of the national distribution. The strongest component scores on US5 are wildfire (60.3) and flood (56.6). These scores are county-linked NRI values published for planning context — all ZIP codes in the same county share the same composite score on US5. Useful when comparing insurance and disaster exposure across areas, not a substitute for a parcel-level flood or fire determination.

Climate normals for St. Martin CDP, OH show little to no average snow and around 46.7 inches of annual precipitation.

IRS migration statistics show a net inflow of about 174 for ZIP 45142 (St. Martin CDP, OH) on US5’s published series — a signal of people/tax filers moving in relative to those leaving. Inflows often track job growth, housing demand, or lifestyle migration; treat the figure as a directional indicator rather than a precise headcount.