The number of legitimate casting agencies in Hollywood, California is a purely subjective and non determinable number. There are too many agencies of different size to accurately determine how many are legitimate.
This link has a list of legit and reputable casting agencies in New York:http://www.joeedelman.com/acting/casting/casting_ny.php#New%20York
If you do an online search for casting agencies within your city/state you will find a list of the legit and reputable castings agencies you can submit to. Searching on the local level instead of looking at all casting agencies will be more realistic for your needs. You'll have to be available in the area for extra work so it doesn't make sense to look into casting agencies that are nowhere near where you live.
There are no legit listed modeling agencies in Fresno, California, unless they are so brand new they are not yet known publicly. You will have to search for agencies in surrounding areas like Bakersfield and Los Angeles.
This link has the most legit and reputable modeling agencies in Los Angeles. Be sure to check out their websites to see what the requirements are for models: http://www.joeedelman.com/agencies/agency_ca.php#Los%20Angeles
Yes. Very much so.
Here is a link to legit modeling agencies in MA:http://www.joeedelman.com/agencies/agency_ma.php
Unfortunately, the Michigan area is not a viable modeling market, which means that there are not many credible, legit and reputable modeling agencies for teens. There are one or two agencies that appear legit but they do not specialize in teen models.
There are way too many modeling agencies in California to name but many are legit, reputable and represent kids. A basic Google search will give you a list of the most notable agencies. Visit the official agency websites, which will contain all of the info you're looking for, including what types of models they represent.
This link will give you a list of legit modeling agencies in the Boston area: http://www.joeedelman.com/agencies/agency_ma.php#Boston
This link will take you to a list of reputable and legit Quebec talent agencies: http://www.actramontreal.ca/actra/talent.htm
You will need to find legit and reputable modeling agencies in your area (within a 2 hour's drive) that represents child models and teen models for that age range. Not all agencies represent children. Once you find those agencies, visit their websites or attend open casting calls if they have them to find out what requirements they are looking for in potential models. Avoid modeling schools, modeling classes or conventions. They are a waste of time and money. It is best to go through the actual agencies themselves. Casting calls and sending information and pictures via email or snail mail is absolutely free and they will tell you right away if your child or teen is what they are looking for or not.
Here is a list to legit and reputable agencies in CA. You'll have to check their websites to see how to submit your pictures and information: http://www.joeedelman.com/agencies/agency_ca.php