Creat or use a macro to merge data into one cell as a list

So basically I have a very large amount of data that I will probably have to run this macro several times for different sections if i'm undesrtanding how they work. I'm trying to consolidate postal codes into one cell for one county, city. Here is an example of what i'm trying to do:

Lincolnshire Grimsby DN31
Lincolnshire Grimsby DN32
Lincolnshire Grimsby DN33
Lincolnshire Grimsby DN34
Lincolnshire Grimsby DN36
Lincolnshire Grimsby DN37
Lincolnshire Grimsby DN41

to

Lincolnshire Grimsby DN31;DN32;DN33;DN34;DN36;DN37;DN41

Can this be done? I'm not very experienced with macros but i'm trying to learn.

Also I'm using Excel 2010