Franklin County area

Population and density of Franklin County

The Census Bureau estimates that 70,698 people lived in Franklin County on July 1, 2025. That ranks #792 of 3,222 county equivalents nationally and #12 of 14 in Massachusetts. Since the April 1, 2020 estimates base of 71,029, the population has declined by 331 (−0.5%), compared with +1.7% for Massachusetts as a whole.

With 699.2 square miles of land, that is 101 people per square mile (39 per km²), placing Franklin County #985 nationally for density and #14 in Massachusetts. The median county equivalent has 47 people per square mile; the Massachusetts median is 673. Put another way, there are about 6.3 acres of land per resident.

U.S. Census Bureau, Vintage 2025 population estimates. Estimates are revised each year and are not decennial census counts. Density divides the whole population by the whole county’s land area, so it describes an average, not how settlement is distributed within the county. Population sources and methods.

Cities and towns in Franklin County

Franklin County is divided into 26 cities and towns. In Massachusetts, county subdivisions are local governments, and together they cover all of the county’s land and residents.

The most populous is Greenfield city, with 17,691 residents (25% of the county). The largest by land is New Salem town, at 44.8 mi², or 6.4% of the county’s land. Among those with at least 1,000 residents in 2020, Colrain town grew fastest since then (+3.1%).

Population: U.S. Census Bureau Vintage 2025 subcounty estimates, counting only the part of each subdivision inside Franklin County. Land: 2026 Census Gazetteer. How communities are listed.

Metropolitan area

Franklin County is a central county of the Greenfield, MA Micropolitan Statistical Area. Franklin County is the area’s only county equivalent, so the micro area has the same 699.2 square miles of land. By combined land it ranks #306 of 542 micropolitan areas, and #105 by population. It belongs to the Springfield-Amherst Town-Northampton, MA Combined Statistical Area.

ZIP codes

33 ZIP Code Tabulation Areas have land in Franklin County; 29 of them have most of their land inside the county, and the others mainly cover neighboring areas.

010020103901054010720109301096013010133001331013370133801339013400134101342013440134601347013490135001351013540135501360013640136701370013730137501376013780137901380

ZIP Code Tabulation Areas are the Census Bureau’s approximations of USPS ZIP Code service areas, from the 2020 Census relationship files. Lighter codes have less than half of their land in this county. Post-office-box and single-address ZIP Codes have no tabulation area.

Counties bordering Franklin County

Franklin County shares a land border with 6 county equivalents, including 3 in Vermont and New Hampshire. It has more land than 2 of them. The largest neighbor is Worcester County (1,510.7 mi²) and the smallest is Hampshire County (527.2 mi²). Together with its neighbors, Franklin County forms a block of 5,830.9 mi² of land, of which it holds 12%.

How big is Franklin County compared with U.S. states?

Franklin County has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 1.5 times as much. Massachusetts’s county land could hold about 11 areas the size of Franklin County.

Another way to picture it: the same land area would fill a square about 26.4 miles (42.6 km) on each side. Real county shapes are rarely square, so this is a scale reference rather than a width or driving distance.

State figures are the sums of each state’s county-equivalent land measurements in the same Census release, so states and counties are compared on the same basis. Published state totals can differ slightly because of rounding. Compare all states · Counties bigger than entire states.

What stands out about Franklin County?

Franklin County has more land than 1,898 of the other 3,221 county equivalents in the dataset.

A median is the middle county-equivalent measurement, not the average of the largest and smallest. All three bars use the same linear scale. Very small areas may appear as a thin sliver; the labels retain their values.

Does including water change its rank?

Using land plus water places Franklin County at #1,340 nationally by total area, 16 places farther from the top than its land rank. Other county equivalents gain more area when their water measurements are included.

Its water share is 3.5%, compared with a national county-equivalent median of 1.2% — 2.3 percentage points higher. This describes the statistical geography’s land/water mix, not flood exposure or developable land.

Closest positions in the national land ranking

These entries sit immediately beside Franklin County in the national ranking. They can be in different states and are not necessarily geographic neighbors.

Calculated from the same Census release as the area table. Total-area order uses original ALAND + AWATER; water shares and chart labels use published square miles. Calculation details.