ROSELAND, N.J. — US private-sector payrolls increased 91,000 in September, led by the service-producing sector and small businesses, according to the ADP employment report released Wednesday.

The August level was revised down to 89,000 from a prior estimate of 91,000, the firm said.

Markets look to ADP’s report on private-sector payrolls to provide some guidance on the US Labor Department’s jobs estimate, due to be released Friday, which includes information on both private and public-sector payrolls.

Analysts polled by MarketWatch expected Friday’s Labor Department employment report to show low overall growth of 59,000 in September, compared with zero in August, and for the unemployment rate to remain at 9.1 percent.

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