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resolver1Flag for United Kingdom of Great Britain and Northern Ireland

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DNS: 2 "A" records for our company. Can i remove one?

We have 2 "A" records for our company:

CompanyName.com
www.CompanyName.com

Can we delete "CompanyName.com"?  I don't think we need it.  What services will be lost?  Just to note our email is received using SMTP pump - a service provided by our ISP.  

I'm OK for http://companyname.com access to be removed because people can access our website through http://www.CompanyName.com.

Thanks
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if you keep both and if a user type invalidArecord.company.com will route to company.com.
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Both point to the same IP.  I would prefer to keep one and then we only have one point of entry for the domain.
There's no delete button on our DNS server so I'm just check with them.  I'll update with details when i hear back from them.
First, I'd point you to the comment by 2nfc - If you want people to be able to get to you by just typing "http://companyname.com" in the browser, without prefixing the "www", then you need both.

Second, I'd ask if you have an MX record, because if you dont, then the plain "companyname.com"  A record is how mail gets to you.  You SHOULD have an MX record pointing to your mail exchanger, but a backup method of mail delivery which is defined in the specification is to use the "A" record of the domain name, so I'd caution you from cleaning up too much unless you really know what you're deleting.
the hosting/ISP deleted the "A" record for companyname.com and we still have mail :-)

Thank you for your detailed post!
Thanks for your time guys