The government reports union membership listed on Dec. 31.
Union president Ron Gettelfinger said Friday that the membership figures don't include workers who haven't begun paying dues because they don't have a contract -- such as casino employees.
Gettelfinger also told Detroit's WWJ-AM that the totals don't include striking workers such as the 3,600 employees at American Axle and Manufacturing Holdings Inc. (NYSE:AXL) who have been off the job since Feb. 26.
The union maintained financial health in terms of assets, according to the report, despite a decline in membership and dues. UAW assets fell slightly to about $1.25 billion last year from $1.26 billion in 2006.
Union dues, meanwhile, fell to nearly $169 million in 2007 from $191 million the previous year. In 2004, for example, dues brought in about $206 million, records show.
Gettelfinger saw a slight increase in salary in 2007, from $145,125 in 2006 to $150,763 last year.