Lamar CISD includes almost 43 percent of Fort Bend County,[citation needed] covering the cities of Richmond, Rosenberg, Kendleton, Simonton, Thompsons, Weston Lakes, a very small portion of Sugar Land, most of Fulshear, most of the village of Pleak, the census-designated place of Cumings, a portion of the Pecan Grove CDP,[1] the community of Lakemont, the unincorporated areas of Booth, Crabb, Foster, and Powell Point, and most of the unincorporated rural areas (including areas in Sugar Land's extraterritorial jurisdiction (ETJ) in central Fort Bend County.

[citation needed] Lamar CISD enrolls over 27,000 students and is the fastest-growing district in Fort Bend County.

In 2013 it received the highest possible academic rating (Met Standard) from the Texas Education Agency.

[4] The names of the Common School Districts were: Rice Farm, Thompsons, Booth, Simonton, Fulshear, Foster, Brandt, George, Cottonwood & Pleak.

[6] KISD and its one school, Powell Point Elementary, were merged into Lamar CISD on July 1, 2010.