My last shot at this - pretty much sure by now!

[itspebbl]

How old are they?
The for sure cockerels are the Cochin and the Wyandotte.
The Australorp is the one up for debate. If "it" is crowing and attacking ya'll, it sounds to me like he's an agressive cockerel.
The other two are pullets

 

[ASD Dad]

I'll need to check the black one's feet. I can pick it up but it has gotten way more aggressive in the past couple of weeks.

Not sure on age to be honest, they were larger chicks when we bought them. If I had to guess I would say around 5 months based on how long we've had them and their size when chicks.

 

[getaclue]

The black one needs to be put into rooster training ASAP. Black Australorps have pinkish colored feet, not yellow.

 

[KikiLeigh02]

If it does have yellow feet I will have to agree with you that it's probably a cockerel. My Jersey Giants took forever to mature. Even if it's not a cockerel I don't think I would hang to a pullet that is that people aggressive.

I'll need to check the black one's feet. I can pick it up but it has gotten way more aggressive in the past couple of weeks.

Not sure on age to be honest, they were larger chicks when we bought them. If I had to guess I would say around 5 months based on how long we've had them and their size when chicks.

 

[ASD Dad]

How old is your Australorp?
Edit: I see yellow between the toes, are the bottoms of the feet yellow too? If they are you have a Jersey Giant instead of a Black Australorp.

The feet are bright yellow on the bottoms! I am thinking this popular chicken lady is a complete quack of a person now... She has several hundred birds on her property and was recommended by a local farmer.

Here are two more photos of that bird.

 

[Ridgerunner]

Is it just me or in that last photo are the tail feathers starting to turn down?

 

[Frazzemrat1]

If that's the age, then the black one (which is a black jersey giant) is definetly a pullet. All chickens go through chicken puberty at 12 weeks, and she would have saddle feathers by now if she was a cockerel. There's nothing saying a pullet can't be aggressive too. I'd dispose of her either way.

 

[JedJackson]

So I have posted these same birds 3 times now and only once has there been a 100% agreement on cockerel vs. pullet. I am 99% sure I know each one now but I wanted to get some experts opinions. Several of these were 50/50 just 2 weeks ago but they sure have changed in that time!

Our biggest issue is we paid a lot extra from a local breeder who pretty much promised pullets. Out of the 6 birds we bought I am pretty sure 3-5 are boys! Not happy about it at all as that leaves us with just two egg layers and a lot of wasted money and time. She already took back one bird (that is why there are only 4 birds in photos) that was a definite cockerel but it was a big pain and borderline ugly so if any of these are cockerels they will be re-homed or culled. Cant have 2 hens and 3 roos!

Pretty sure there are 3 cockerels and 2 pullets in these photos. The only boy we wanted in the first place is the Cochin to the left of first photo. Hopefully he is definitely a boy (he is crowing a lot). I have a feeling that one other could be a cockerel though (meaning all 4 in that first photo)... If we seriously end up with 4 boys and 1 girl it's going to get really ugly at the lady's farm this weekend... We're sticking with the small local farm supply store from now on.

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There is really only one questionable bird and that is the black one. Its comb and wattles are as big and red as can be but there is not other signs of it being male. So it's either a very late developing cockerel or just a pullet with an exceptionally large comb and wattles. I believe it is a pullet, myself, because of the complete lack of male traits. Its legs aren't thick, it has no male feathering or even signs of male feathering. But if it is mean and aggressive and making people bleed, then it really doesn't matter what sex it is. It needs to go. A few eggs are not worth the danger to children and adults alike, and it could hurt the other chickens, too.

Of the rest, I think you already know which is which.

The barred Cochin is a cockerel.
The Gold laced Wyandotte is a cockerel.
The blue bird is a pullet.
The barred bantam with the little crest is a pullet.

So you've got 2 cockerels, 2 pullets, and 1 undetermined bird which needs to go regardless of what sex it is.

That's how I see it, anyway.

 

[itspebbl]

Since the bottom of the "Australorp"'s feet are yellow, he's actually a Jersey Giant, which are extremely slow at maturing, explaining his lack of rooster feathers right now.
I agree with @JedJackson and everyone else saying that he needs to go. You have some great potential cockerels, so why bother with one that is already endangering you and your family's safety and is only going to get larger?

 

[PirateGirl]

I agree with @JedJackson as well