Alabama state

Limestone occurs in the Tennessee Valley and in the Ridge and Valley

Region, as well as in areas of the Gulf Coastal Plain. Marble is found in

Coosa and Talladega counties.

Petroleum is the most important mineral of the Gulf Coastal Plain. It has been found in the extreme southwestern counties. There are important salt deposits north of Mobile. Henry and Barbour counties, as well as other parts of the state, have deposits of bauxite, a claylike mineral from which aluminum is obtained.

| POPULATION |

|TOTAL: 3,893,888 (1980 census). Density—29.6 |

|persons to each square kilometer (76.7 persons |

|to each square mile). |

|GROWTH SINCE 1820 |

|Year Population |

|Year Population |

|1820 127,901 |

|1920 2,348,174 |

|1860 964,201 |

|1960 3,266,740 |

|1880 1,262,505 |

|1970 3,444,354 |

|1900 1,828,697 |

|1980 3,893,888 |

|Gain Between 1970 and 1980—13.1 percent |

|CITIES: Fifteen of Alabama's cities have a |

|population of more than 25,000 (1980 census). |

|Birmingham 284,413 Prichard 39,541 |

|Mobile 200,452 Florence 37,029 |

|Montgomery 177,857 Bessemer 31,729 |