NEW YORK (AP) _ Many Americans do not share President Reagan's view that the state of the nation is strong and on the right track, according to network polls released Monday.

An ABC-Washington Post poll found that 59 percent of those surveyed believe the nation is "seriously off on the wrong track." A CBS-New York Times poll reported that only 36 percent felt that the state of the nation has improved over the past five years, compared with 40 percent who judged conditions to be worse.

On the topic of Contra aid, CBS found opposition to U.S. assistance to the Nicaraguan rebels by a margin of 58 percent to 30 percent. Opposition came from all demographic groups, including the president's fellow Repuiblicans.

CBS conducted its survey by telephone Jan. 17-21, contacting a random sample of 1,663 adults nationwide. ABC phoned 1,505 people from Jan. 17-23.

The margins of error for registered Democrats polled was four percentage points in the CBS poll and five percentage points in the ABC poll. The margins of error for the Republican samples were five points in both polls.