Can I restrict to only US and Canadian customers?

Can I restrict my store to US and Canada only? How do I set it up so that addresses outside of those two zones are rejected?

Thanks,
Matt

I would also like to know if there is an answer to this.
I would like to restrict registration (hence orders) to certain locations (ie UK and Ireland)

Build a Zone with just those countries ... and add to the Payment and Shipping Modules that you are using ...

Not in the Zones? You cannot checkout ...

Thanks Ajeh, but I am not sure I fully understand the answer.

In the Zones table I have all all the standard zones installed by the default installation, and also zones I have added for the UK.

Are you saying that all Zones except the UK ones have to be removed in Admin/Location-Taxes/Zones to prevent people checking out from other countries.

Or am I misunderstanding your reply.

Thanks

In Zones ... it is asking for the 2 character ISO code ...

For the United Kingdom, the 2 character ISO code is: GB

It is not: UK

Sorry Ajeh, but I am still confused.

In Zones ... it is asking for the 2 character ISO code ...The only place where GB appears is in the Countries table.
In the Zones table I have a listing of all the Counties in the UK and they are shown as
'Country': United Kingdom - 'Zones': Somerset (etc) - 'Code': Somerset(etc)

So the only place where GB is showing is in the Countries Table.

So Back to the problem of selectively choosing counties from which orders are allowed.

The whole issue of Zones and Zone definitions is very unclear.

In the Wiki (http://www.zen-cart.com/wiki/index.php/Admin_-_Locations/Taxes_-_Zones_Definitions)
it tries to clarify the Zones/Zone Definitions, but in it there are comments which are unclear.
For example the Wiki states

You always have to define at least one zones definition, and every location (country or state) you plan to sell to should be included in one of your zones definitions.

and....

You can define two zones definitions: one containing all the states except Florida, and one containing just Florida. Then you can specify the Tax Rate that the zone Florida should use.But in Admin/Zone Definitions you are allowed to specify a Zone Name and a Zone Description and nothing else. There is no facility to add 'all the States except Florida'. Similarly when you select 'Details' the Country can be chosen, but only one Zone or 'All Zones' can be chosen for each Zone Definition.

Here is what I currently have set up in Admin:Location/Taxes.

Countries - contains all Countries and their ISO codes.

Zones - Contains all the States/Provinces/Counties for each country

Zone Definitions - Contains only one entry which has a Zone Name of 'UK VAT' and a Zone Description of 'UK VAT Rates'. In the 'Details' for this I have selected 'United Kingdom' and 'All Zones'.

I was under the impression (obviously incorrectly) that if the Zones were not included in the Zone Definitions that Checkout was not possible. But with only a Zone Definition for the United Kingdom if someone registering with a United States Address places an order, they can check out.

What am I missing here?

There are multiple methods to setting Zones ...

The Zones shipping module is NOT using zones you create ... it is defined based on the 2 digit ISO code for the countries ...