Pi wasn't the only thing celebrated yesterday on March 14. Equal Pay Day is also celebrated on the same day — a day to examine the decades of advocacy to extinguish the pay gap between men and women.

Unfortunately, nationwide the gap is still large. The latest Census Bureau says women make 18 percent less money than men do. We know the numbers for Texas and several of its cities, thanks to a new study by small biz experts Chamber of Commerce. They investigated the earnings for full-time workers in 170 of the most populous cities in the United States.

The analysis found that Texas has the 29th largest pay gap out of all 50 states, with women making nearly $11,000 less than men. Texas women can be glad they don’t live in Wyoming, which has the largest pay gap of the states at almost $19,000.

The city with the largest gender pay gap in the United States is Sunnyvale, California, home to Silicon Valley, with an earnings difference of $40,584 between men and women. Actually, California cities make up half of the top 10 largest gender pay gaps.

Texas, however, has two towns in the top 10. Coming in at No. 2 is Frisco and McKinney lands at No. 5. Frisco men make nearly $40,000 more than women, while McKinney men make $29,000 more than women. Just outside the top 10 is Plano at No. 12, with their gender pay gap adding up to $20,736.

How does Houston fair? Not too shabby, actually. The Bayou City landed at the No. 114 spot out of 170 of the most-populated cities in the U.S. Dallas actually has the smallest gender pay gap in Texas, coming in at No. 166 with just $192 between full-time working men and women.

Here's how the rest of Texas ranks:

• No. 13 – Austin
• No. 25 – Pasadena
• No. 30 – Lubbock
• No. 45 – Fort Worth
• No. 70 – Irving
• No. 71 – Corpus Christi
• No. 74 – San Antonio
• No. 89 – Arlington
• No. 93 – Grand Prairie
• No 97 – El Paso
• No. 101 – Laredo
• No. 110 – Amarillo
• No. 125 – Brownsville
• No. 134 – Garland

The full study can be found on chamberofcommerce.org.

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This article originally ran on CultureMap.