Camden and Hackney councils jointly won the award for Best Large Team.
Camden also won Best Campaign (London councils) and Best A-Z Publication.
The team, led by head of comms Paul Inglefield, has had a momentous year, starting with crisis comms around the fire that enveloped Camden Market in February.
Inglefield said: 'The way we responded to the fire improved our reputation in the organisation. We really did lead the entire response.'
Earlier in the day Inglefield gave a presentation at the CIPR Local Government Conference in Bath, explaining how his team dealt with the fire during a discussion of crisis comms.
Inglefield outlined how his team kept the public informed, built coalitions and created advocates using a full range of comms channels. A week on, an ongoing council-led marketing campaign was launched to ensure the market remained a top tourist attraction in London.
In the same session, Associated British Foods head of external affairs Geoff Lancaster discussed Primark's response to a damaging Panorama expose.
Other winners included Wolverhampton City Council for Best Small Team. Westminster City Council won Best Media Relations Campaign for its Sat Lav campaign, and Metropolitan Police Service won Best Campaign for its firearms campaign.
Essex County Council won PR on a Shoestring and Hackney Council won Best Use of e-Media. Norfolk County Council won Best Campaign for Hard to Reach Groups.
Nottingham City Council won Best Civic Newspaper/Magazine with a Circulation of 60,000 and Over. South Oxfordshire District Council won the prize for Under 60,000 Circulation.