US > Maryland > Baltimore County > Monkton, MD 21111

21111 ZIP Code Profile, Map, Data & Demographics

Related Place Profiles:

Hereford, MD | Monkton, MD

ZIP Code 21111: Basic Data & USPS Preferred City Name

Preferred Name, USPS

Monkton, MD 21111

Acceptable Alternative

Hereford, MD 21111

ZIP Code Type: STANDARD
County: Baltimore County
Centroid: Latitude 39.57, Longitude -76.593
Time Zone: Eastern Time Zone (UTC -5 hours)
Observes DST: Yes

ZIP Code 21111 has segments in 2 Counties / Independent Cities (Baltimore, Harford).

Businesses Addresses: 167
PO Box Addresses: 87
Residential Addresses: 1,903

Multi-Family Addresses: 0
Single Family Addresses: 1,903

The ZIP Code maps and database are updated 4 times per year.
Database updated: March 1, 2026, Maps updated: May 1, 2024.

Monkton, MD 21111 Data & Demographics

Source: 2020-2024 American Community Survey 5-Year Estimates

POPULATION
Total Population	4,714 (100%)
Population Density	133 per sq mi
Diversity Index¹	16


INCOME
Median Household Income	$136,304
Per Capita Income	$69,759
Median Home Value	$607,200

HOUSING
Total HU (Housing Units)	1,939 (100%)
Owner Occupied HU	1,822 (94.0%)
Renter Occupied HU	86 (4.4%)
Vacant Housing Units	31 (1.6%)

HOUSEHOLDS
Total Households	1,908
Average Household Size	2.47
Family Households	1,360 (71.3%)

NOTES

The Diversity Index estimates the likelihood that two persons chosen at random from the same area belong to different race or ethnic groups, based on five groups: Hispanic/Latino, Non-Hispanic White, Non-Hispanic Black, Non-Hispanic Asian, and Non-Hispanic Other/Multiracial. A value of 0 indicates the population belongs entirely to one group. Higher values indicate a more evenly mixed population. Calculated from U.S. Census Bureau ACS 5-year estimates (table B03002).

Monkton, MD 21111 - Peer Comparisons by Rank and Percentile

The table below compares 21111 to the other 33,772 ZIP Codes in the United States by rank and percentile using 2020-2024 American Community Survey 5-Year Estimates data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description	Rank	Percentile
Total Population	# 13703	59th
Population Density	# 14296	58th
Median Household Income	# 1945	94th
Per Capita Income	# 2132	94th
Diversity Index	# 22819	32nd

Additional comparisons and rankings can be made with a VERY EASY TO USE Maryland Census Data Comparison Tool.

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21111 ZIP Code Profile, Map, Data & Demographics

ZIP Code 21111: Basic Data & USPS Preferred City Name

Monkton, MD 21111 Data & Demographics

POPULATION

INCOME

HOUSING

HOUSEHOLDS