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The father-of-three often ran his 26.2-mile (42km) route before starting work at the Sellafield nuclear site.
As he crossed the finish line, he thanked the "fantastic" reception.
And he later revealed in a tweet that he had reached his £1m goal in aid of charities.
Cheered on by crowds, he started his latest challenge at 08:30 GMT and finished at about 14:00 GMT in front of a fireworks display.
Mr McKee has gone through more than 20 pairs of trainers, run more than 9,500 miles (15,300km) and finished his final marathon at about 14:00.
Speaking afterwards, he said: "The streets were lined. It was raining, but everybody was out clapping and shouting.
"It was fantastic seeing everybody there. It's something I'll always remember."
www.bbc.co.uk...