PlainZIP

Watertown, OH · standard

ZIP Code 45787

Washington County, Ohio - USPS delivery-area record. The Census publishes no ACS estimates for this ZIP, so no demographic or housing figures are shown.

29
392/sq mi High-density area

National ZIP placement

Watertown has 29 residents, placing it among the least populous of the 33,099 US ZIP codes with a reported population, at 392 people per square mile.

Source: USPS ZIP record + U.S. Census Bureau ZIP population. Rank compares ZIP 45787 against every US ZIP with a reported population; income/home-value percentiles are not available for this ZIP.

ZIP code 45787 is a sparsely populated ZIP (a standard USPS delivery area) in Watertown, Washington County, Ohio, home to just 29 residents across 0.1 square miles, a density of 392 people per square mile, in the New York time zone.

The Census withholds ACS estimates for many sub-100-resident and PO-box ZIPs; only the USPS delivery-area record is shown here.

This page carries no survey figures; where they exist on other ZIPs they come from the U.S. Census Bureau American Community Survey 5-Year Estimates (including median rent) and the FHFA House Price Index, no estimates, no proprietary scoring. Verify with Census →

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Source: U.S. Census Bureau, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + FHFA HPI ACS demographics and median rent, ZBP business establishments, FHFA HPI for ZIP 45787, Watertown, OH · 2023 Census ACS 5-Year Estimates use a rolling 60-month sample for stable small-geography estimates; ZBP updated annually; FHFA HPI updated quarterly/annually.

Quick Facts

29

Population

0.1

Area (sq mi)

392

People / sq mi

New York

Time Zone

standard

ZIP Type

Nearby ZIP Codes

Want a side-by-side? Compare 45787 vs 45786 →

ZIP Code City Population Distance
45786 Waterford, OH 3,253 2.6 mi
45729 Fleming, OH 1,289 4.0 mi
45715 Beverly, OH 2,630 9.4 mi

Related Areas

Washington County Watertown, OH Ohio

Frequently Asked Questions

What county is ZIP code 45787 in?

ZIP code 45787 (Watertown) is located in Washington County, Ohio. Washington County contains multiple ZIP codes, see the full list at /counties/washington-oh.

What is the population of ZIP code 45787?

ZIP code 45787 in Watertown, OH has a population of 29 according to the Census Bureau ACS 2023 estimates.

Data sources

ZIP 45787's figures come from ACS 5-Year Estimates, Census ZIP Code Business Patterns, and the FHFA House Price Index. See our methodology for details.

Take this with you

What to do with ZIP 45787's numbers, next.

ZIP Code Tabulation Areas (ZCTAs) are Census Bureau approximations of USPS ZIP codes; figures describe the ZCTA area, not any single address within it.

This page explains the source records, calculation, and limits behind the figures shown. ZIP-level Census records are displayed directly; county, state, and national comparisons are calculated from those published records. Read our editorial standards and corrections policy, the methodology behind these numbers, or report a correction. Data current as of 2026-08-25.