If you live in Coupland, you are in the 31st Congressional District, just barely. Some people in the 78615 zip code are in the 17th District. If so, Bill Flores is your man.
Otherwise, most Couplanders are represented by John Carter.
Here is his local contact information.
John Carter (31st District)
One Financial Centre
1717 North IH 35
Round Rock, TX 78664