Residential delivery area · Maryland
ZIP Code 21111: Monkton, MD
ZIP code 21111 uses the postal name Monkton, Maryland and lies mostly in Baltimore County (77% of its land) with the rest in Harford County (Census 2020 ZIP-county file). About 4,700 people live there (Census Bureau, ACS 2020-2024). Median household income is $136,304 (Census Bureau, ACS 2020-2024). Its land lies outside any incorporated or census-designated place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Monkton · its only residential ZIP
- County
- Baltimore County (77%); Harford County (23%)
- Metro area
- Baltimore-Columbia-Towson, MD
- House districts
- MD-1 (75%), MD-2 (25%) 119th Congress, by share of land
- State
- Maryland
- Time zone
- Eastern
- Land area
- 35.3 sq mi · 133 people per sq mi
Where is ZIP code 21111?
21111 centers on 39.576°, -76.590° and covers 35.3 square miles of land plus 0.2 of water. It borders 7 ZIP codes: 21131, 21152, 21161, 21120, 21013, 21084, 21047.
The map draws ZIP code areas only. For the streets inside 21111, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 21111 compare with the rest of Baltimore County?
| Measure | 21111 | In Baltimore County | In MD |
|---|---|---|---|
| People (ACS 2020-2024) | 4,714 | 42nd of 57 | 241st of 477 |
| Median household income | $136k | 5th of 42 | 83rd of 293 |
| Median home value | $607k | 5th of 45 | 51st of 320 |
Its median household income is higher than in 94% of U.S. residential ZIP codes, and it is denser than 58% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 21111?
The 2020 Census counted 5,062 people in 21111; the ACS, which samples households over 2020-2024, estimates 4,714. Between the 2010 and 2020 censuses its population grew 3.2% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 4,714±674 (90% margin)
- 2020 Census count
- 5,062+3.2% since 2010 (4,903)
- Households
- 1,908
- Median age
- 48.7
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 21111?
Of the 4,714 people the ACS estimates in 21111, 23.9% are under 18 and 23.8% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (91.7%).
- Under 1823.9%
- 18 to 6452.2%
- 65 and older23.8%
- White, not Hispanic91.7%
- Black, not Hispanic2.8%
- Other or two or more2.8%
- Hispanic or Latino2.2%
- Asian, not Hispanic0.5%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 21111 earn?
Median household income is $136,304 (ACS 2020-2024), the 5th highest of the 42 ranked ZIP codes in Baltimore County. It is not measurably different from 2015-2019 ($162,796 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $136,304±$26,449
- Income per person
- $69,759
- Below the poverty line
- 6.3%
- Unemployed (of the labor force)
- 8.6%
- Adults 25+ with a bachelor's degree
- 63.7%
- Adjusted gross income per tax return, 2022
- $237,2372,520 returns; wages 49% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 21111?
FHFA's house price index for 21111, built from repeat sales and appraisals of the same homes, rose 49% from 2015 to 2025 and rose 39% from 2020 to 2025, and moved +6.2% in 2025.
- Median home value (owners' estimate)
- $607,200
- Median gross rent
- $1,359
- Homes owned by their occupants
- 95.5%
- Housing units
- 1,939
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 21111?
119 business establishments had a location in this ZIP code in 2023, 6 fewer than in 2018; the most are in construction (ZIP Code Business Patterns).
- Construction25
- Professional, scientific, and technical services17
- Retail trade12
- Real estate and rental and leasing11
- Health care and social assistance9
- Administrative and support and waste management and remediation services8
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 21111?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 21131 | Phoenix | 7,141 | $198k | 4.9 mi |
| 21152 | Sparks Glencoe | 6,459 | $121k | 5.3 mi |
| 21161 | White Hall | 5,221 | $108k | 6.0 mi |
| 21120 | Parkton | 7,440 | $162k | 6.7 mi |
| 21013 | Baldwin | 5,610 | $171k | 6.9 mi |
| 21084 | Jarrettsville | 7,070 | $122k | 7.1 mi |
| 21047 | Fallston | 13,852 | $158k | 8.7 mi |
| 21031 | Hunt Valley | 26 | – | 7.1 mi (near) |
| 21030 | Cockeysville | 25,827 | $89k | 7.1 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.