Combining two subnets

Actually, the mask would need to be 255.255.252.0 at a minimum.  Is the line between locations an ethernet line?  If so, this should work.  If a T1, there is more to it.

it is a Metro-E line,

Okay, should work then.  You just need to change the subnet mask on every device.

Assuming there are no routers involved, as you stated, make sure each computer has the same subnet mask and you can use either of the options below:

Option1: Subnet of 255.255.252.0 and this will give you a complete range of 192.168.0.1 through 192.168.3.254.

Option 2: Subnet of 255.255.254.0 and this will give you a complete range of 192.168.0.1 through 192.168.1.254 ... OR ... 192.168.2.1 through 192.168.3.254.

Since you span 192.168.1.xxx and 192.168.2.xxx, you can use option 1 or change one of the network subnets, depending on security.

I dont want to include 3 though. Can I use 253 if I just want 0, 1 and 2?

Nope, 255.255.253.0 is not a valid mask.  It isn't a big deal if you aren't using 3.  In fact, it is there for future use if you need it.

It is a big deal because I have another facility that we route to that is .3

Okay, you didn't mention that.

Well, it may be simplest then to route between metro-e locations.  Otherwise, you will need to address one side and use a 255.255.254.0 mask.  192.168.0.0 and 192.168.1.0.

What about going with 255.255.0.0?

That just makes it bigger. 255.255.254.0 is the only one you can use unfortunately or keep two seperate 255.255.255.0's and route.

255.255.0.0 is 192.168.0.0 - 192.168.255.254

Since you don't want 192.168.3.xxx, you're only option is subnet mask 255.255.254.0 and change your 192.168.2.xxx subnet to 192.168.0.xxx, leaving the 192.168.1.xxx alone (option 2 in my original post).
Good luck!