To sign up for a free library card, you must visit any Lamar County Library System location and provide one form of identification and one proof of residency. You may join the Lamar County Library System for free even if you do not reside in Lamar County.

Any person may use materials in-house. To check out any materials (or to carry materials out of the library), patrons must obtain a library card. Anyone 18 years or older with Identification and a current proof of address may get a free library card.

Those 16-17 years of age can sign themselves up for a library card as long as they bring the required materials mentioned in the next section. Until a parent or responsible adult comes in to sign for the library card, patrons 16-17 will be limited to 2 items when checking out. Patrons in this age range may not use the Internet unless a parent or responsible adult signs the Acceptable Use Statement.