Maryland
Postal abbreviation MD. 605 ZIP codes across 24 counties.
| Population | 6,206,011 |
|---|---|
| Postal abbreviation | MD |
| ZIP codes | 605 ZIP codes → |
| Area codes | 227240301410443667 |
| Time zone | Eastern |
| Counties | 24 |
Largest cities by population
Baltimore · 573,243Columbia · 104,338Germantown · 90,719Frederick · 83,395Waldorf · 82,943Silver Spring · 81,462Ellicott City · 75,257Glen Burnie · 72,590Gaithersburg · 69,825Bethesda · 69,397Rockville · 67,671Dundalk · 65,969Towson · 58,679Severn · 58,402Bowie · 57,926Potomac · 45,902Odenton · 45,002Hagerstown · 43,665Catonsville · 43,368Annapolis · 40,720Essex · 40,580Severna Park · 40,228Clinton · 38,376Owings Mills · 37,245Randallstown · 35,957Olney · 35,797College Park · 34,540Pasadena · 34,309Montgomery Village · 34,110Pikesville · 33,524
Largest counties by population
Montgomery County · 1,065,949Prince George's County · 959,754Baltimore County · 850,796Anne Arundel County · 598,166Baltimore city · 573,243Howard County · 336,328Frederick County · 287,048Harford County · 263,757Carroll County · 175,321Charles County · 170,527
Counties in Maryland
Allegany CountyAnne Arundel CountyBaltimore cityBaltimore CountyCalvert CountyCaroline CountyCarroll CountyCecil CountyCharles CountyDorchester CountyFrederick CountyGarrett CountyHarford CountyHoward CountyKent CountyMontgomery CountyPrince George's CountyQueen Anne's CountySomerset CountySt. Mary's CountyTalbot CountyWashington CountyWicomico CountyWorcester County
Population: U.S. Census Bureau, ACS 5-year estimates, 2024.