Revised unemployed statistics made public yesterday showed a signaficantly higher rate of joblessness in the District last year than reported previously,a development which could mean increased federal jobs aid this year.

According to the D.C. Department of Manpower,which comples employment data for all area governments, unemployment in the city of Washington averaged 9.1 per cent of the work force for the full year compared with a previous estimate of 7.4 per cent.

The average number of persons without jobs in the city was increased to 30,000 a month from the previous estimate of 25,700.

While District unemployment levels were estimated to be higher, yesterday's report indicated that joblessness in the suburbs of Maryland and Virginia was somewhat lower last year than reported in earlier months.

For the entire metropolitan area, including the District, the unemployment estimate was revised downward to 5.2 per cent from 5.4 per cent and the number of people out of work was reduced to 75,000 from 77,800. About 40 per cent of all area unemployment is concentrated within the District, according to yesterday's report.

Nationwide, unemployment in January was estimated at 7.3 per cent, based on surveys taken before natural gas shortages led to widespread factory closings.

According to William B. Clatanoff Jr., chief of the manpower department's reports and analysis division, estimated labor forces for all states and major areas are adjusted each year by the U.S. labor Department's Bureau of Labor Statistics.

Armed with the most recent population and labor force estimates, the BLS establishes new "benchmarks" for employment data. The population data is based on monthly surveys by the Census Bureau but Clatanoff said that because of sampling limitations, it is impossible to provide sound data each month for use in unemployment figures.

The monthly reports on area joblessness are based on techniques developed and prescribed by the Labor dent could have serious repercussions Department, taking into account new and continuedclaims for unemployment compensation and other factors.

Clatanoff emphasized that all unemployment estimates are subjected to error but he said that overall, yesterday's report is more accmurate than recent monthly figures issued by his office. A similar revision in data can be expected next year when the BLS again adjusts population and work force estimates for the Washington area.

Yesterday's report estimated the District's work force at the end of 1976 at 330,800, compared with an earlier estimate of 344,200. Total civilian jobs were estimated at 305,500 compared with the earlier projection of 322,100.

For the whole area, the latest work force estimate is 1.46 million (cp from the earlier estimate of 1.45 million) and total jobs were 1,393 million, a slight increase from 1.387 million.

The jobs data reflect a continuing trend increasing suburban employment but stagnation within the District economy. Washington's population also fell last year to 702,000 - a decline of 55,000 or 7.3 per cent from 1970. At the same time, populations in the Maryland and Virginia area grew modestly.

Since some federal aid to depressed economic regions and cities is keyed to rates of unemployment, the new report could mean increased federal funding, according to District officials. In addition, the gloomier jobs data could help convince President Carter to restore $10 million to the annual federal payment which was cut out by former President Ford.

Secretary of Commerce Juanita M. Kreps yesterday apportioned $133,145 to the D.C. government for public works projects as part of $20 million in aid to all states, for use in areas of high unemployment. The funds can be used for public facilities or for loans to encourage private firms and to expand and create jobs provided states contribute at least 25 per cent of the costs of such projects, she said.