FIPS Code | State | County name | 2003 Rural-urban continuum code | Description | County population 2000 |
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| 24001 | MD | Allegany County | 3 | County in metro area of fewer than 250,000 population | 74,930 | | 24003 | MD | Anne Arundel County | 1 | County in metro area with 1 million population or more | 489,656 | | 24005 | MD | Baltimore County | 1 | County in metro area with 1 million population or more | 754,292 | | 24009 | MD | Calvert County | 1 | County in metro area with 1 million population or more | 74,563 | | 24011 | MD | Caroline County | 6 | Nonmetro county with urban population of 2,500-19,999, adjacent to a metro area | 29,772 | | 24013 | MD | Carroll County | 1 | County in metro area with 1 million population or more | 150,897 | | 24015 | MD | Cecil County | 1 | County in metro area with 1 million population or more | 85,951 | | 24017 | MD | Charles County | 1 | County in metro area with 1 million population or more | 120,546 | | 24019 | MD | Dorchester County | 6 | Nonmetro county with urban population of 2,500-19,999, adjacent to a metro area | 30,674 | | 24021 | MD | Frederick County | 1 | County in metro area with 1 million population or more | 195,277 | | 24023 | MD | Garrett County | 6 | Nonmetro county with urban population of 2,500-19,999, adjacent to a metro area | 29,846 | | 24025 | MD | Harford County | 1 | County in metro area with 1 million population or more | 218,590 | | 24027 | MD | Howard County | 1 | County in metro area with 1 million population or more | 247,842 | | 24029 | MD | Kent County | 6 | Nonmetro county with urban population of 2,500-19,999, adjacent to a metro area | 19,197 | | 24031 | MD | Montgomery County | 1 | County in metro area with 1 million population or more | 873,341 | | 24033 | MD | Prince George's County | 1 | County in metro area with 1 million population or more | 801,515 | | 24035 | MD | Queen Anne's County | 1 | County in metro area with 1 million population or more | 40,563 | | 24037 | MD | St. Mary's County | 4 | Nonmetro county with urban population of 20,000 or more, adjacent to a metro area | 86,211 | | 24039 | MD | Somerset County | 3 | County in metro area of fewer than 250,000 population | 24,747 | | 24041 | MD | Talbot County | 6 | Nonmetro county with urban population of 2,500-19,999, adjacent to a metro area | 33,812 | | 24043 | MD | Washington County | 3 | County in metro area of fewer than 250,000 population | 131,923 | | 24045 | MD | Wicomico County | 3 | County in metro area of fewer than 250,000 population | 84,644 | | 24047 | MD | Worcester County | 4 | Nonmetro county with urban population of 20,000 or more, adjacent to a metro area | 46,543 | | 24510 | MD | Baltimore city | 1 | County in metro area with 1 million population or more | 651,154 |
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