FIPS Code | State | County name | 2003 urban influence code | Description | 2000 population |
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| 04001 | AZ | Apache County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 69,423 | | 04003 | AZ | Cochise County | 5 | Micropolitan adjacent to a small metro area | 117,755 | | 04005 | AZ | Coconino County | 2 | Small-in a metro area with fewer than 1 million residents | 116,320 | | 04007 | AZ | Gila County | 3 | Micropolitan adjacent to a large metro area | 51,335 | | 04009 | AZ | Graham County | 8 | Micropolitan not adjacent to a metro area | 33,489 | | 04011 | AZ | Greenlee County | 8 | Micropolitan not adjacent to a metro area | 8,547 | | 04012 | AZ | La Paz County | 4 | Noncore adjacent to a large metro area | 19,715 | | 04013 | AZ | Maricopa County | 1 | Large-in a metro area with at least 1 million residents or more | 3,072,149 | | 04015 | AZ | Mohave County | 3 | Micropolitan adjacent to a large metro area | 155,032 | | 04017 | AZ | Navajo County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 97,470 | | 04019 | AZ | Pima County | 2 | Small-in a metro area with fewer than 1 million residents | 843,746 | | 04021 | AZ | Pinal County | 1 | Large-in a metro area with at least 1 million residents or more | 179,727 | | 04023 | AZ | Santa Cruz County | 5 | Micropolitan adjacent to a small metro area | 38,381 | | 04025 | AZ | Yavapai County | 2 | Small-in a metro area with fewer than 1 million residents | 167,517 | | 04027 | AZ | Yuma County | 2 | Small-in a metro area with fewer than 1 million residents | 160,026 |
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