Maryland counties
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There are 24 counties and county-equivalent in Maryland. The City of Baltimore in Maryland is considered a county rather than an independent city.

Most Maryland counties were named after relatives of the Barons Baltimore who were the proprietors of the Maryland colony from 1634 to 1771.

Below is a list of all the counties in Maryland.

Maryland Counties – List of Counties in Maryland (in Alphabetical order)

County Name County Seat FIPS Code Year Formed Population (as of 2019)
Allegany County Cumberland 001 1789 70,416
Anne Arundel County Annapolis 003 1650 579,234
Baltimore County Towson 005 1659 827,370
Baltimore City Baltimore City 510 1851 609,032
Calvert County Prince Frederick 009 1654 92,525
Caroline County Denton 011 1773 33,049
Carroll County Westminster 013 1837 168,447
Cecil County Elkton 015 1672 102,855
Charles County La Plata 017 1658 163,257
Dorchester County Cambridge 019 1668 31,929
Frederick County Frederick 021 1748 259,547
Garrett County Oakland 023 1872 29,235
Harford County Bel Air 025 1773 255,441
Howard County Ellicott City 027 1851 325,690
Kent County Chestertown     029 1642 19,536
Montgomery County Rockville 031 1776 1.051 million
Prince George’s County Upper Marlboro 033 1696 909,327
Queen Anne’s County Centreville 035 1706 50,381
Somerset County Princess Anne 039 1666 25,616
St. Mary’s County Leonardtown     037 1637 113,510
Talbot County Easton 041 1662 37,181
Washington County Hagerstown 043 1776 151,049
Wicomico County Salisbury 045 1867 103,609
Worcester County Snow Hill 047 1742 52,276

1. Allegany County  

Maryland counties

Allegany County Maryland had a population of 70,416 (as of 2019) according to the U.S. Census Bureau. Its county seat is Cumberland.

This county is located in the northwestern part of Maryland. Its name “Allegany” comes from a local Lenape word “Welhik hane” or “oolikhanna” meaning best flowing river of the hills or beautiful stream.

It was established December 25, 1789 and its largest city is Cumberland.

2. Anne Arundel County  

maryland counties

Anne Arundel County’s population as of 2019 was 579,234. The county was established on April 9, 1650. Its county seat is Annapolis which is also Maryland’s capital.

Anne Arundel County was named after Lady Anne Arundell who was a member of the ancient family of Arundells in Cornwall England and also the wife of Cecilius Calvert the second Baron Baltimore.

This county’s largest community is Glen Burnie.

3. Baltimore County 

Maryland Counties

This is the 3rd most-populous county in Maryland with a population of 827,370 (as of 2019). Baltimore County is part of the Baltimore Metropolitan Area as well as part of the Northeast Metropolis Area.

Baltimore County was established June 30, 1659 and named after Cecil Calvert the second Baron Baltimore. Its county seat is Townson and its largest community is Dundalk.

4. Baltimore City  

counties in Maryland

Baltimore City was formed in 1729 and became an independent city in 1851. As of 2019, it had a population of 609,032 making it one of the most-populous cities in the United States. It is also the largest independent city in the United States.

5. Calvert County  

maryland counties

Calvert County Maryland’s population as of 2019 was 92,525. Its name Calvert is derived from the family name of the Barons of Baltimore, the proprietors of the English colony of Maryland.

It was formed in 1654 and its county seat is Prince Frederick. The largest town in Calvert County is Chesapeake Beach.  

6. Caroline County  

maryland counties

This is a rural county located on the eastern shore in Maryland. Caroline County was established in 1774 and its county seat is Denton which is also the largest town in the county.

 It is shares boundary with Queen Anne’s County (to the north), Talbot County (to the west), Dorchester County (to the south), Kent County, Delaware (to the east), and Sussex County, Delaware (to the southeast).

7. Carroll County   

Maryland counties

Carroll County was formed January 19, 1837 and was named after Charles Carroll of Carrolton. Its county seat is Westminster and its largest community is Eldersburg.

8. Cecil County  

Maryland counties

Cecil County Maryland is located in the northeastern part of Maryland and borders both Pennsylvania and Delaware.

It was established June 6, 1674 and named after Cecil Calvert the 2nd Baron Baltimore. Its county seat is Elkton which is also the largest town in Cecil County.

9. Charles County

Maryland counties

Charles County was established April 13, 1658 and was named after Charles Calvert the third Baron Baltimore. Its county seat La Plata and its largest community is Waldorf.

Charles County is located in the southern part of Maryland and as of 2019 had a population of 163,257.

10. Dorchester County  

Maryland Counties

Dorchester County was formed in 1669 and was named after Earl of Dorset a family friend of the Calverts (the proprietors of the Maryland colony).

Its county seat is Cambridge which is also the largest city. It is the largest county by total area on the Eastern Shore in the U.S. state of Maryland.

11. Frederick County  

Maryland Counties

This is county is located in the northern part of Maryland. It had a population of 259,547 (as of 2019). Frederick County was founded in 1748 and its county seat is Frederick.  

Frederick County is home to the amazing Catoctin Mountain Park.

12. Garrett County  

Maryland Counties

Garrett County is located in the western part of the U.S. state of Maryland. It was established November 4, 1872 and named after John Work Garrett.

It is the third-least populous county in Maryland with a population of 29,235 (as of 2019). Its county seat is Oakland and its largest town is Mountain Lake Park.

13. Harford County  

Maryland counties

Bel Air is its county seat. Harford County was founded December 17, 1773 and named after Henry Harford the fifth proprietor of Maryland.

14. Howard County  

Maryland counties

Howard County was founded in 1838 and was named after John Eager Howard. Its county seat is Ellicott City and its largest community is Columbia.

15. Kent County

Maryland Counties

Kent County is the least populous county in Maryland with a population of 19,536. It was established in 1642 and was named after Kent a county in South England.

Its county seat is Chestertown which is also the largest town in the county.  

16. Montgomery County  

Marylland counties

Montgomery County was founded in 1776 and was named after Richard Montgomery. As of 2019, it had a population of 1.051 million making it the most populous county in Maryland.

Its county seat is Rockville which is also the largest city.  

17. Prince George’s County

maryland counties

Prince George’s County also abbreviated as PG County was founded April 23, 1696. It was named after Prince George of Denmark.  

It is the second most populous county in Maryland with a population of 909,327 (as of 2019). Its county seat is Upper Marlboro and largest city is Bowie.

18. Queen Anne’s County  

Maryland Counties

Queen Anne’s County was founded in 1706 and was named after Queen Anne a queen of England, Scotland and Ireland in 1702-1707.

Its county seat is Centreville and its largest community is Stevensville.

19. Somerset County

Maryland counties

This county is located in the southernmost part of Maryland. Somerset County was established in 1666 and was named after Mary, Lady Somerset.

Its county seat is Princess Anne which is also the largest town.

20. St. Mary’s County  

Maryland counties

St. Mary’s County was formed in 1637and was named after Mary the mother of Jesus. Its county seat is Leonardtown and largest community California.

St. Mary’s County as the home to the first Maryland Colony as well as the first capitol of the Colony of Maryland.

St. Mary’s County is home to the Patuxent River, Naval Air Station, and St. Mary’s College of Maryland.

21. Talbot County  

Marlyand counties

Talbot County was founded in 1661 and was named after Lady Grace Talbot the wife of Sir Robert Talbot an Anglo-Irish statesman and sister of Lord Baltimore Cecil Calvert.

Its county seat is Easton which is also the largest town.

22. Washington County  

Washington County Maryland

This county is located in the western part of Maryland. It was the first county in the United States to be named after the Revolution War general and later President George Washington.

Its county seat is Hagerstown which is also the largest municipality.

23. Wicomico County  

Wicomico County Maryland

Wicomico County was founded in 1867 and was named after the Wicomico River. Its county seat is Salisbury which is also the largest city in the county.

It is located in the south eastern part of Maryland and as of 2109 had a population of 103,609.  

24. Worcester County

Worcester County Maryland

Worcester County was founded in 1742 and was named after the family of Marquees of Worcester. Its county seat is Snow Hill and its largest community is Ocean Pines.

There you have all the list of Maryland Counties. Hope you find this list helpful.

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