I dont know exactly when he moved there but he has NOT been there his whole life. There was an episode that I remember seeing where Spongebob came to Bikini Bottom looking for a home with a realtor and he didnt see anything he liked and then a pineapple dropped from above so he moved in there.
SpongeBob SquarePants lives in a pineapple in Bikini Bottom which is meant to be located in Pacific Ocean, Bikini Atoll.
His city's name is called Bikini Bottom.
SpongeBob lives in Bikini Bottom likely located somewhere beneath Bikini Atoll
Man Ray is not seen in Battle for Bikini Bottom.
Rock Bottom
in the bikini bottom
Bikini Bottom
Bikini Bottom
SpongeBob SquarePants lives in a pineapple in Bikini Bottom which is meant to be located in Pacific Ocean, Bikini Atoll.
spongebob lives in a pineapple under the sea in pacific ocean, and in one episode, he is revealed to live on Conch Drive.
Bikini Bottom
Bikini Bottom
plankton
Bikini Bottom Hospital. Source: spongebob.wikia.com/wiki/Bikini_Bottom_Hospital
SpongeBob SquarePants - 1999 Legends of Bikini Bottom was released on: USA: January 2011
He stays in Bikini Bottom
A tampon!