<P> The show follows the adventures of stepbrothers Phineas Flynn ( Vincent Martella ) and Ferb Fletcher ( Thomas Sangster ) , who live in the fictional city of Danville , in a ( never specified ) Tri-State area , as they seek ways to occupy their time during their summer vacation . Often these adventures involve elaborate , life - sized and ostensibly dangerous construction projects . Phineas 's older sister , Candace Flynn ( Ashley Tisdale ) , has two obsessions : `` busting '' Phineas and Ferb 's schemes and ideas , and winning the attention of a boy named Jeremy ( Mitchel Musso ) . Meanwhile , the boys ' pet platypus , Perry , acts as a secret agent for an all - animal government organization called the O.W.C.A. ( `` Organization Without a Cool Acronym '' ) , fighting Dr. Heinz Doofenshmirtz . </P>
<P> The show follows the adventures of stepbrothers Phineas Flynn ( Vincent Martella ) and Ferb Fletcher ( Thomas Sangster ) , who live in the fictional city of Danville , in a ( never specified ) Tri-State area , as they seek ways to occupy their time during their summer vacation . Often these adventures involve elaborate , life - sized and ostensibly dangerous construction projects . Phineas 's older sister , Candace Flynn ( Ashley Tisdale ) , has two obsessions : `` busting '' Phineas and Ferb 's schemes and ideas , and winning the attention of a boy named Jeremy ( Mitchel Musso ) . Meanwhile , the boys ' pet platypus , Perry , acts as a secret agent for an all - animal government organization called the O.W.C.A. ( `` Organization Without a Cool Acronym '' ) , fighting Dr. Heinz Doofenshmirtz . </P>
what is the tri state area in phineas and ferb
what is the tri state area in phineas and ferb
never specified
never specified