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U.S. ZIP Code 01821
5-digit United States postal code #01821, Billerica, MA
ZIP code 01821 is located in the city (place name) Billerica, сounty Middlesex in the state of Massachusetts. The population in ZIP code 01821 is 30310 and the population density is 706.4. ZIP code 01821 refers to сounty Middlesex having сounty FIPS 25017, the ratio of people from different counties in this ZIP code is as follows: all county weights - 25017: 100%. In the area of the ZIP code 01821 valid time zone America/New_York.
ZIP: 01821
County: Middlesex
Place Name: Billerica
State: Massachusetts
State Abbreviation: MA
Coordinates: 42° 33' 0.612" N, 71° 15' 7.812" W
Latitude: 42.550170000000
Longitude: -71.252170000000
Population: 30310
Density: 706.4/km2
Time zone: America/New_York
County FIPS: 25017
All county weights: 25017: 100%