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ZIP code 21104

Marriottsville, MD · Howard County

About ZIP code 21104

  • ZIP code 21104 is in Marriottsville, Howard County, Maryland.
  • About 6,052 people live in it, which is 137 people per square mile.
  • It also reaches into Carroll County and Baltimore County.
  • Time zone: Eastern Standard Time.
  • The middle of the ZIP code is at 39.350, -76.907.

A ZIP code is a mail delivery area, not a town border, and one ZIP code can cover parts of several towns. To check a single address, use the US Postal Service lookup.

Ellicott City, MD

The closest town we cover is Ellicott City, MD, about 6 miles from the middle of this ZIP code. 75,257 people live in Ellicott City. Typical household income is $156,964. A typical home costs $661,700.

  • Stronger than most towns on: Long, healthy lives, Home internet and working from home and Diversity & community.
  • Weaker than most towns on: Cost of living, Property taxes and Pleasant weather for being outdoors.

See all figures for Ellicott City

Other ZIP codes in Ellicott City

Nearby ZIP codes

ZIP code list from SimpleMaps US Zips. Population is a US Census Bureau estimate. These are estimates, so check official sources before you decide.