Median household effective buying income for the Baltimore-Washington region ranked first among the nation's 10 largest markets in 1990.

According to figures compiled by the Washington/Baltimore Regional Association, median household effective buying income, after taxes, in the Baltimore-Washington region maintained first place by adding $1,293 worth of income per household. The household total increased from $38,031 in 1989 to $39,324 in 1990.

San Francisco ranked second, with a median household income of $39,032. Boston ranked third with the median household income of $36,445. Others in the top 10 were New York, Los Angeles, Chicago, Philadelphia, Dallas-Fort Worth, Detroit and Houston.

"Our continued growth in income and high national ranking is an important measure of the underlying strength and stability of this region's economy," W/BRA Chairman Benjamin R. Civiletti said.