ZIP Code 21057 - Glen Arm Maryland
Overview
ZIP Code 21057 is located in Glen Arm Maryland. Portions of 21057 are also in Carney and Hampton and Perry Hall and Long Green. 21057 is entirely within Baltimore County. Regionally, 21057 is located in Metro Baltimore.
ZIP Code 21057 Quick Stats
| ZIP Code Name | Glen Arm |
| Primary County | Baltimore County |
| ZIP Code Type | Standard |
| Population (2022) | 4,530 |
| Area Code(s) | 410 / 443 / 667 |
| Current Time | EDT |
ZIP Code 21057 Map
21057 Demographics
21057 can be classified socioeconomically as Middle Class class compared to other ZIP Codes in Maryland based on Median Household Income and Average Adjusted Gross Income. The majority race/ethnicity residing in 21057 is White. The current unemployment level in 21057 is 4.4%.
| Population | 4,530 |
| Population Growth Rate | 0% |
| Population Density | 293 People per Square Mile |
| Total Households | 1,549 |
| Percentage High Income Households | 15.7% |
| Median Household Income (2021) | $131,184 |
| Average Adjusted Gross Income (2021) | $412,050 |
| Current Unemployment Rate (May 2026) | 4.4% |
| Sales Tax Rate (2025) | 6% |
| Majority Race/Ethnicity | White - 91.22% |
21057 Race/Ethnicity Breakdown
| Race/Ethnicity | Total | Percentage |
|---|---|---|
| White | 4,258 | 91.22% |
| Black | 123 | 2.63% |
| Hispanic | 243 | 5.21% |
| Asian | 35 | 0.75% |
| Native American | 9 | 0.19% |
| Hawaiian/Pac. Islander | 0 | 0% |
21057 Educational Attainment Levels
| Highest Education Level | Total | Percentage |
|---|---|---|
| Less Than 1 Year of College | 117 | 4.35% |
| Bachelor Degree | 748 | 27.8% |
| High School Diploma | 484 | 17.99% |
| No High School Diploma | 61 | 2.27% |
| GED or Alternate | 60 | 2.23% |
| 1 or More Years of College | 360 | 13.38% |
| Associates Degree | 165 | 6.13% |
| Masters Degree | 401 | 14.9% |
| Professional Degree | 232 | 8.62% |
| Doctorate Degree | 63 | 2.34% |
21057 Geography
| Coordinates | 39.44646835, -76.50499725 |
| Adjacent ZIP Codes | |
| Cities/Towns in 21057 | |
| Region | Metro Baltimore |
| Metropolitan/Micropolitan Stat Area | Baltimore-Columbia-Towson, MD |
| Time Zone | Eastern Daylight Time |
| IANA Timezone | America/New_York |
| Area | 15 Square Miles |
21057 Schools
| School Districts in 21057 | |
| Elementary Schools in 21057 | |
| Middle Schools in 21057 | |
| High Schools in 21057 |
21057 Weather and Climate Data
| Plant Hardiness Zone | Zone 7a: 0F to 5F | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Average First Frost Date | October 21 - 31 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Average Last Frost Date | April 11 - 20 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Koppen-Geiger Climate Zone | Cfa - Humid Subtropical Climate | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Ecoregion | 64c - Piedmont Uplands | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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