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| | U.S. Police Agency Structure and Organization |
 | | In other states (Michigan for example), a state police agency may be assigned to a single city or county, and for all practical purposes, is a local police agency. |
 | | Some of the first State Police agencies were the Texas Rangers (1835), the Colorado Mounted Rangers (1861), the PA Capitol Police (1895), the Arizona Rangers (1901), the New Mexico Mounted Police (1905), but the Pennsylvania Constabulary (1905) are usually recognized in most textbooks as the first full-service, non-volunteer agency. |
 | | Railway police agencies are generally counted at the county level, but hospital, port, airport, and tunnel police agencies are often counted at the local level. |
| faculty.ncwc.edu /toconnor/polstruct.htm |
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