ing,
What Gump is saying is basically true but let's expand here for you a bit.
Simple thought's;
they live where there's lots of water......
Statistically speaking, yes, it is harder to find and acquire a float flying job. As whole of the GA fleet floatplanes are small and the percentage of those that are worked by hired pilots are are even less.
That said, if you want a float flying job go get one. When I was reaching flying age I knew I wanted to fly floats and where I grew up in New York was pretty much dried up of float flying so I went to Seattle and Alaska to network and learn. Then after a couple of years of working on the dock and building time flying jumpers I finally got to fly some 135 float action when I was about 20. Seattle into B.C. every day, some of the most fun, most beautiful country to work in, and most scared I have been in an airplane! Wouldn't trade those experiences for anything.
But you will have to go seek it out and it may take time. My seaplane mentor did the same thing. He grew up with some family floatplanes in the Adirondacks of New York but knew it would be hard to keep going another twenty years there so he packed up and moved to Seattle. Worked for Kenmore flying charters, networked with some of the San Juan Island fat-cat's while flying them out on Friday and back on Sunday, and ended up with four corporate Beaver's that he flew and managed.
Seaplanes are definitely less and less every year other than where they are totally required so it is harder now than twenty years ago. My father used to fly 206's in New York city out of 23rd street but that is all but gone other than the odd private Caravan. At one time until the late 80's it was four operators running 12 or so airplanes.
You'll need to think Alaska (southeast if you want year-round), Seattle (year-round but slower in winter), Minnesota (a lot of single-pilot operators, won't do you much good but ask anyway), Maine (also a lot of single pilot ops). That's the meat of it in U.S. territory.
There is also Seaborne with twin otter's. Not sure now but the M.O. used to be the Virgin Islands in winter and Ketchikan, Alaska in summer. They fly two pilot crews so you can start in the right to build time.
There was also one guy running an op in Hawaii with a 206 and Beaver, it's for sale I believe.
Usually you will find a steady flow of guys coming and going in Key West going to Fort Jefferson. I think right now it's someone from Alaska, it used to be some of the New York city crew in winter.
You will also find the odd individual running a single pilot or family flight instruction or sightseeing deal in weird places. I flew tours one summer in San Francisco in a Beaver and I believe they are still there but under new ownership. The seaplane base is on the north side of the bay in Mill Valley. There is a guy in Maryland doing ratings in his T-craft, etc.
Outside the U.S.;
First and easiest, Canada! My wife is Canadian so I'm partial. PLENTY of seaplane action there all across the country with year-round going on in B.C. and I believe some in Labrador/Newfoundland. The B.C. scene is crazy. Stand in Victoria harbour (proper spelling for you Canadians reading!) and watch turbine single Otters, Beavers, and Twin Otters coming in and out all day long from Vancouver. Another good B.C. spot is further up Vancouver Island, Campbell River.
Good book for you to find about B.C. float flying; "Coast dog's don't lie" by Jack Schofield
There is a LARGE quantity of Twin Otter operators in the Maldives. They run to the resorts. Supposedly fun, rough water, a lot of beaching.
A few missionary operators are running floats in the Amazon, other parts of South America, New Guinea, etc.
There are quite a few operators in New Zealand and some in Australia.
You will find a couple in other parts of the South Pacific as well if you look.
Supposedly a couple of floatplanes in Scotland, and Italy.
And I'm sure there's a bunch more that I haven't even touched.
Start here;
www.seaplanes.orgwww.seaplanejobs.comwww.weloveseaplanes.comIf you don't mind working your ass off, being scared in the fog occasionally, and being generally broke for a while, it's some of the most fun flying and best life experiences with some of the coolest people you'll ever meet.
Have fun and if you don't wear them now, switch to boxer shorts, that way the first time you lose one at the dock in the wind or current and have to strip down and swim for it your passengers won't be laughing at a guy in his "tighty-whitey's" with cold water shrinkage.