Naturally "popular" is a fairly broad term considering that can only be gauged with ratings and those can change monthly, weekly & daily, and of course are you speaking of kids shows on cable, syndication, PBS, network (granted there aren't many kids shows on network anymore), also are "Family" shows considered "Kids" and vice versa ...
... however looking at the Cable Nielsen ratings for September 7th 2012, it appears Spongebob Squarepants is currently the most popular i.e. highest rated kid's program.
See Provided Link and keep up with the ratings to see which kid's show is the most popular.
In animation:
2. Penguins of Madagascar
In live action:
1. iCarly
2. True Jackson, VP
3.big time rushhh
Actually, Dragonball Z Kai is the most popular show on Nicktoons. Avatar use to be the most popular until DBZ Kai was on air. Dragonball, Dragonball Z, Dragonball Z Kai, and Dragonball GT is the biggest and most popular anime series in the world
Well I'm a teen and i absolutely love Adventure time!
there's spongebob, fairy god parents, the other ones aren't that popular.
Currently in 2011, the most popular shows on Nickeldeon are: Spongebob, Dora The Explorer, Go Diego Go, iCarly, Big Time Rush, and Victorious.
The most popular shows on PBS kids is Arthur which has been on the air for years. Also there are other shows which are good for children such as Fetch! and Postcards from Buster.
Dora the Explorer
nickelodeon short show with the talking belly
Nickelodeon won't be canceled. It is a popular t.v. station.
The link below has a list of every Nickelodeon show ever made.
actually no it is not
its on nickelodeon
Icarly is the most popular tv show on Nickelodeon.
No.Rugrats appears to be the most popular (i.e. viewership numbers) in Nick's history.
my favorite nickelodeon show is spongebob squarepants the most popular one is loud house
no cartoonnetwork is
it depends on which Nickelodeon show you like the most
ben 10
Her and Miranda Cosgrove
it was cancled for a while but then brought back to the U.S. by popular demand
As of August 2014, SpongeBob SquarePants is still usually the highest rated show on Nickelodeon, although that's not hard to be the 'most watched' when it's on multiple times a day every day.
Logan, Carlos, and James are the most popular. Logan and Carlos are tied for fan favorite.
Mad Styles Fashion By Tru Jackson off of her popular nickelodeon show
She starred in the shows "All That" and "The Amanda Show" on Nickelodeon.