Gas, KS has a population of 664 and is the 17,784th largest city in the United States. The population density is 923 per sq mi which is 2530% higher than the Kansas average and 918% higher than the national average. The median age in Gas is 39 which is approximately 7% higher than the Kansas average of 36. In Gas, 69% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 83% of Gas residents were born in Kansas, 17% were born out of state, 0% were born outside of the United States and 0% were foreign born.