Waltham, Massachusetts

Waltham population, 2020 to 2024

Waltham added 1,611 residents from July 2020 to July 2024, a change of +2.5%. In the latest year it moved by +684. Among 58 Massachusetts places of 5,000 or more, that growth ranks 14th; the median place changed by +1.2%. The median place of 5,000+ in Massachusetts has 44,052 people, so Waltham is 1.5 times that size.

Waltham covers 12.75 square miles of land and 1.02 of water, for 5,165 people per square mile of land. The median Massachusetts place of 5,000+ has 2,852, so Waltham is denser than the typical town.

What county Waltham is in

All of Waltham's residents live in Middlesex County, which had 1,668,956 residents in 2024. Waltham holds 3.9% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.

ZIP codes in Waltham

3 ZIP Code Tabulation Areas (ZCTAs) overlap Waltham by at least 10% of the ZCTA's or the city's land: 02451, 02452, 02453. ZCTAs are Census approximations of USPS ZIP code delivery areas. The list comes from the 2020 ZCTA to place relationship file, so a city that annexed land after 2020 may reach into ZIP codes not listed here.

Where Waltham is

The Census internal point of Waltham is at 42.388900, -71.242300. Boston, the capital, is 9.3 miles ESE in a straight line. The nearest larger place is Newton, MA (90,700 people), 4.3 miles away. The nearest city of 100,000 or more is Cambridge, MA, 6.4 miles away.

Daylight in Waltham

At 42.39° N, Waltham gets about 15 h 17 min of daylight around the June solstice and 9 h 04 min around the December solstice, a swing of 6 h 13 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.

Places near Waltham

The eight nearest incorporated places of 1,000+ in Massachusetts, measured between internal points. The closest is Watertown, 3.5 miles away, with 35,985 people.