The 940-564 exchange applies to phone numbers in the town of OLNEY from the state of TX. The 940-564 exchange is serviced by Brazos Telephone Cooperative and is a Land Line exchange.
To learn more about the 940-564 region, go to http://en.wikipedia.org/wiki/OLNEY
The three numbers after the area code are commonly referred to as the NXX - short for Central Office (exchange) code. Often considered part of a subscriber number. The three-digit Central Office codes are assigned to a specific CO serving its customers, but may be physically dispersed by redirection, or forwarding to mobile operators and other services. To learn more about how the telephone numbering system works in the USA, go to http://en.wikipedia.org/wiki/North_American_Numbering_Plan or http://en.wikipedia.org/wiki/564
The term exchange area can be used to refer to an area served by a particular switch, but is typically known as a wire center in the US telecommunications industry. The exchange area is usually the combination of the area code and the NXX. The exchange code or Central Office Code refers to the first three digits of the local number (NXX). It is sometimes confused with the area code (NPA).
Phone Number: 940-564