Contents -- Introduction -- Subjects Covered, by Geography Type -- National Data Maps -- Part A: States -- Highlights and Rankings -- State Column Headings -- Table A -- Part B: States and Counties -- Highlights and Rankings -- States and Counties Column Headings -- Table B -- Part C: Metropolitan Areas -- Highlights and Rankings -- Metropolitan Areas Column Headings -- Table C -- Part D: Cities of 25,000 or More -- Highlights and Rankings -- Cities of 25,000 or More Column Headings -- Table D -- Part E: Congressional Districts of the 109th Congress -- Highlights and Rankings -- Congressional Districts Column Headings -- Table E -- Appendix A: Geographic Concepts and Codes -- Appendix B: Metropolitian Statistical Areas, Metropolitan Divisions, and Components -- Appendix C: Core Based Statistical Areas and Metropolitan Divisions with 2004 Estimated Population -- Appendix D: Maps of Congressional Districts and States -- Appendix E: Cities by County -- Appendix F: Source Notes and Explanations.