U.S. home prices continued their rise in April with the growth slightly down from previous readings, a report said on Tuesday.

The S&P CoreLogic Case-Shiller U.S. National Home Price NSA Index reported a 6.4 percent annual gain in April, down from 6.5 percent in the previous month, according to a report released by S&P Dow Jones Indices.

The 10-City Composite annual increase came in at 6.2 percent, down from 6.4 percent in the previous month. The 20-City Composite posted a 6.6 percent year-over-year gain, down from 6.7 percent in the previous month.

Seattle, Las Vegas, and San Francisco continue to report the highest year-over-year gains among the 20 cities. In April, Seattle led the way with a 13.1 percent year-over-year price increase, followed by Las Vegas with a 12.7-percent increase and San Francisco with a 10.9-percent increase.

Nine of the 20 cities reported greater price increases in the year ending April 2018 versus the year ending March 2018, said the report.

After seasonal adjustment, the National Index recorded a 0.3-percent month-over-month increase in April. The 10-City and 20-City Composites posted 0.1 percent and 0.2 percent month-over-month increases, respectively.

"The favorable economy and moderate mortgage rates both support recent gains in housing," said David M. Blitzer, Managing Director and Chairman of the Index Committee at S&P Dow Jones Indices, adding that the continued low supply of homes for sale is also a factor pushing prices up.