NEW YORK (AP) _ At least two-thirds of households in five U.S. markets have Internet access, with Portland, Ore., and Seattle boosting penetration of 70 percent, according to a survey released Tuesday.

Portland's Internet access level in March represented a 29 percent increase from a year ago, while Seattle's went up 25 percent.

Nielsen/NetRatings based its findings on random telephone surveys, which had sample sizes ranging from 400 to 800 per market. The company could not provide the margin of sampling error for the surveys.

Neilsen Media Research conducts similar surveys for television, and the Internet market areas it uses were the same as those for TV.

The other top markets were: San Francisco, with 69 percent penetration; Boston, 68 percent; San Diego, 66 percent; Washington, D.C., 65 percent; Denver, 63 percent; Orlando, Fla., 61 percent; Hartford/New Haven, Conn., 61 percent; Kansas City, 61 percent.