Median rental rates are spiking in Texas and across the U.S.

San Francisco, Calif. One-bedroom:$3,530 Two-bedroom: $4,900 San Francisco, Calif. One-bedroom:$3,530 Two-bedroom: $4,900 Photo: George Rose, Getty Images Photo: George Rose, Getty Images Image 1 of / 30 Caption Close Median rental rates are spiking in Texas and across the U.S. 1 / 30 Back to Gallery

Texas' rental market is becoming increasingly expensive.

There are five Lone Star State cities in a U.S. ranking of rising rents compiled by Zumper, an apartment rental research site that just released its National Rent Report for September, 2015.

That's bad news for millennials who can't afford homeownership.

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Instead, they're opting to rent in central parts of town, which is driving up rents in city centers.

"A number of current market dynamics have led to the rent hikes: millennials migrating to urban areas, a lack of new affordable housing construction, and a fundamental shift in public attitude toward the sharing economy," Zumper reports. "People are also getting married later in life, leading to a displacement of the start of the traditional home buying cycle."

That study also reveals that Houston is the "21st most expensive rental city in the country, with prices for a one bedroom up 4.1 percent. Two bedrooms were also up 4.4 percent." That puts it among among 14 cities around the country that have seen double-digit percentage increases this past year.

Austin "stalled last month after a rapid 12 percent rise in prices over the past year."

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Dallas also stuck at its same median price, and both Fort Worth and San Antonio saw month-over-month increases.

Rising rents may be a concern for Texans, but the Lone Star State is relatively affordable.

San Francisco renters have a real reason to complain. In August, the median price for a one-bedroom apartment in that city was $3,530.

Take a look at the average median price rents for one- and two-bedroom apartments in the gallery above.