The Marine Corps Recruiting Command (MCRC) is responsible for military recruitment of civilians into the USMC.
The Marine Corps manages the recruiting districts by dividing the country in half using the Mississippi River as a marker. Generally, all areas west of the Mississippi River are covered by the Western Recruiting Region and all areas east are covered by the Eastern Recruiting Region. Each recruiting region is divided into three districts for a total of six Recruiting Districts across the nation. Each District then is broken into Recruit Stations. Each Marine Recruit Station (RS) has 10-15 Marine Recruit Substations (RSS). There are approximately 48 recruiting stations in the nation and about 575 recruiting sub-stations.
1st Marine Corps Recruiting District Includes Albany, Buffalo, Harrisburg, New Jersey, New York, Pittsburgh, Portsmouth and Springfield areas.
4th Marine Corps Recruiting District Includes Baltimore, Charleston, Cleveland, Detroit, Frederick, Louisville, Raleigh, and Richmond recruiting offices.
6th Marine Corps Recruiting District Includes Atalanta, Baton Rouge, Columbia, Ft Lauderdale, Jacksonville, Montgomery, Nashville and Orlando USMC recruiting offices.
8th Marine Corps Recruiting District Includes Albuquerque, Dallas, Denver, Forth Worth, Houston, Oklahoma City, Phoenix, and San Antonio Marine Corps recruiting areas.
9th Marine Corps Recruiting District Includes Kansas City, Chicago, Des Moines, Indianapolis, St Louis, Lansing, Milwaukee, Minneapolis and St Paul recruiting offices.
12th Marine Corps Recruiting District Includes Portland, Sacramento, Los Angeles, San Diego, and Orange County Marine Corps recruiting offices.
Here is a pretty interesting powerpoint on USMC recruiting:
http://www.cops.usdoj.gov/pdf/conference/rand/ChoikeZeliffPresentation.pdf