Drink driving, public order offences and concerns for welfare were among more than 360 incidents made to Suffolk Police on New Year's Eve.
Suffolk police said it was an "exceptionally busy" 11-hour period with 361 incidents between 7pm on December 31 and 6am on January 1.
More than 400 calls were received during the evening.
While there were no major incidents, a spokesman said officers were called to missing person cases, drink driving, concerns for welfare, domestic abuse and public order offences.
A spokesman for Suffolk police said: "We have had a busy Christmas and New Year and we have also had to deal with the impact of Covid on our officers and staff while continuing to police Suffolk.
"Call centres have worked hard and received hundreds of calls every day, we appreciate the high demand for 999 calls has meant it has taken longer to answer the 101 calls."
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