The number of job openings in the United States hit a record high in June and exceeded market expectations.

The number of job openings in the US exceeded expectations and hit an all-time high in June, highlighting the continuing challenges facing companies in recruiting enough workers to keep up with the economic rebound.

The number of job openings rose to 10.1 million in June and revised to 9.5 million in May, according to the (JOLTS) survey of job vacancies and labor turnover released by the Labor Department on Monday. Economists expect the June figure to be 9.27 million.

Employers have been scrambling to fill a large number of vacant jobs in the face of a rebound in consumer demand for services such as travel and dining out, but the supply of labour remains limited.

The labor supply is expected to increase in the coming months as supplementary federal unemployment benefits expire and schools reopen. But if growing concerns about the epidemic prompt Americans to delay returning to work, the rapid spread of the Delta variant could delay greater progress in labour force participation.

The number of voluntary departures rose to 3.9 million in June, and the turnover rate rose to 2.7 per cent.