Go into your contacts app, view the contacts list, then go into the app's settings. Somewhere in there you'll find an option to import/export contacts (possibly under 'contacts management', but as LG will use their own contacts app it will depend where they put it). Choosing 'export' lets you export them to a vcard file (.vcf) which you can then copy to your computer. That's a standard format which you can import into any contacts management program.
The actual contacts database is in a location you won't be able to see without root (basic information security: if it was in a 'public' place any app with filesystem access would be able to copy your contacts and upload them to their favourite spam sites), so exporting them is the way to do it.
If you sync them with a cloud service (e.g. your GMail account) you can probably export them from there as well.