Mona and I love to eat...that being the case we have eaten at just about every restaurant in the Katy area. Here are our picks for the best Mexican restaurants in Katy...and they have some of the best Mexican food we have ever eaten anywhere!
La Finca:

Website: www.lafincatx.com
this restaurant is located at 23930 Westheimer Parkway near the Grand Parkway (99) 77494. The Phone is 281-693-0140. The food is great and the prices are unbelievable...this is one of the best deals in Katy. The service has always been really good and it is easy to get in and out when you are in a rush.
El Jarrito:

Website: www.eljarrito.com
Another great choice...and a real kid friendly choice is El Jarrito located at 21724 Highland Knolls Dr just east of Mason Rd in Katy, 77450. The phone is 281-579-8844. This place has a great menu, lots of specials, and a large bar. The outdoor patio includes a kids sandbox and play area...so you can enjoy your food while the kids play. Juanita's Special is my favorite!
Los Cucos:
Website: www.loscucos.com
This is our favorite. Great food, two locations in Katy (one at the Katy Mills Mall that is shiny and new and one in old Katy on hwy 90 at ave D). The original is awesome and you will get the Old Katy flavor. The new one is larger and you might even get a three piece band walking around and playing your Mexican favorites. The food is some of the best you will ever find and the menu is so large you will be planning what you will have your next time back. The Mall location is on the road surrounding the mall Katy 77494. It is on the west side of the mall parking lot.
Los Cucos has always been one of my favorites. If you ever make it out to Sugar Land there is Los Tios and Ninfa's in Missouri City that has a great bar and staff.