State profile · MD
Maryland ZIP Codes
Demographics, income, and housing across every ZIP code in Maryland, benchmarked against all 50 states, DC and Puerto Rico.
- 468
- ZIP codes
- 5,773,561
- Population
- $114,125
- Avg ZIP income
- 24
- Counties
The verdict
Maryland holds the 30th-most ZIP codes in the country, with an average ZIP household income 58% above the national ZIP median — 4th of 52 states & territories.
- #30
- of 52 by ZIP count
- #4
- of 52 by avg income
- 5,773,561
- people across all ZIPs
- 24
- counties covered
Ranks compare this state against all reporting states using ZIP-level Census ACS 5-Year aggregates.
Maryland (MD) contains 468 ZIP codes spread across 24 counties and 395 distinct cities. Together those ZIP areas cover a total population of 5,773,561 based on Census ACS 5-Year Estimates. ZIP-level granularity matters here: Maryland stretches across very different economic zones, and a single state-wide average hides the 10x spread you will see between its highest-income and lowest-income ZIP codes in the table below.
The economic baseline across Maryland ZIPs shows an average median household income of $114,125 and an average home value of $447,459, with a state-wide average median age of 43.4. These averages are computed over every ZIP in MD with reported data, not weighted by population, so small rural ZIPs count the same as metropolitan ones. Use them as a reference line, then drill into the ZIP tables to see where affluent suburbs, rural counties, and urban cores deviate from the state mean.
The largest urban concentrations in Maryland by population are Baltimore, Silver Spring, Hyattsville, Gaithersburg, Rockville, and each city aggregates multiple ZIP codes worth of Census data on its own city page. Every record in this view comes from publicly available federal datasets, primarily the U.S. Census Bureau American Community Survey and USPS ZIP Code Tabulation Area files, with no proprietary scoring, estimation, or editorial adjustment. Click any county to drill down to its ZIP-level detail, or jump directly to a ZIP code to see household income, housing cost, demographic breakdown, nearby ZIPs, and FHFA home-price history for that specific five-digit area.
Largest cities in Maryland
Top 10 cities by population in Maryland
Total resident population aggregated from every ZIP code the Census assigns to each city.
- Baltimore
Baltimore, MD
632,623 residents
- Silver Spring
Silver Spring, MD
282,095 residents
- Hyattsville 150,988
Hyattsville, MD
150,988 residents
- Gaithersburg 135,332
Gaithersburg, MD
135,332 residents
- Rockville 130,569
Rockville, MD
130,569 residents
- Frederick 120,323
Frederick, MD
120,323 residents
- Laurel 102,149
Laurel, MD
102,149 residents
- Bowie 95,216
Bowie, MD
95,216 residents
- Hagerstown 95,186
Hagerstown, MD
95,186 residents
- Columbia 95,072
Columbia, MD
95,072 residents
What this shows Population concentrates heavily in the state's largest metros, while most of its 395 cities are far smaller, a pattern the ZIP-level tables below make concrete.
Counties in Maryland
Which cities have the most ZIPs in Maryland?
Side-by-side: Compare 21234 vs 20906 →
ZIP Codes in Maryland
More MD ZIP codes
Official Data Resources
Frequently Asked Questions
How many ZIP codes are in Maryland?▼
What is the average income in Maryland?▼
What are the largest cities in Maryland?▼
Source: U.S. Census Bureau, American Community Survey (ACS) 5-Year Estimates (2023); USPS ZIP Code Tabulation Areas via the HUD USPS Crosswalk.
Read our methodology to see how this data is sourced, computed, and verified.