AT&T's (NYSE:T) wireline workers in its Southwest region voted to ratify a four-year contract, the company announced today.

This new contract covers 20,000 Communications Workers of America District 6 union members in Arkansas, Kansas, Missouri, Oklahoma, and Texas. Last Aug. 17, workers in AT&T's Midwest region ratified a three-year contract, and on Dec. 7 Southeastern region workers ratified their three-year agreement.

If the recently announced three-year tentative agreement between AT&T West and the CWA's District 9 union members is ratified, 77,000 AT&T wireline employees will be under contract.

Fool contributor Dan Radovsky owns shares of AT&T. The Motley Fool has no position in any of the stocks mentioned. Try any of our Foolish newsletter services free for 30 days. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.