Moderate housing costs, the quality of schools and the proximity to major metropolitan areas are the main reasons why West Jordan ranks seventh on a list of the fastest-growing medium-sized communities in the United States, according to a survey compiled by Century 21 Real Estate Corp.

It shows that West Jordan's population increased 84 percent from 1984-88, but the average selling price of housing in the area was $75,000, a 1 percent increase in the last 12 months.Century officials asked the U.S. Census Bureau to rank the fastest- growing communities in the United States. They were divided into small, medium and large categories. Then, company employees conducted a survey among their brokers to determine average selling prices, rates of appreciation or depreciation over the last 12 months and the reasons for growth.

In the medium-size community category, Moreno Valley, Calif., had a 213 percent increase in population during the survey period and the average selling price of a house was $132,000. That was followed by Palm Bay, Fla.; Chandler, Ariz.; Henderson, Nev.; Naperville, Ill.; Cape Coral, Fla.; West Jordan; Fontana, Calif.; Coral Springs, Fla.; and Rancho Cucamonga, Calif.

About 75 percent of the fastest-growing communities are in the so-called Sun Belt with eight in California, seven in Florida, five in Arizona and three in Texas.