Here is a start to a list I am putting together:

Vacation Rentals close together for Large Groups

North Oregon Coast
Netarts
Happy Camp Hideaway – luxury homes, townhomes and cabins close together
http://www.beachcombersnw.com/00142

Happy Camp Bay/ Ocean View Townhouses – 4 Units Sleeps up to 32
http://www.beachcombersnw.com/01171

Rockaway
Large Group Condos
Each unit sleeps 24 w/8 bedrooms & 8 baths
Manhattan Beach
http://www.beachcombersnw.com/01528
Oregon Beach Vacations
1.800.723.2383
Email: obv@oregonbeachvacations.com

Central Oregon Coast

Lincoln City Area
Dog House (Sleeps 14) http://www.beachcombersnw.com/00407
Is only 2 mins away from Inlet Gardens (sleeps 12)
http://www.beachcombersnw.com/00109

Dog House(sleeps 14) http://www.beachcombersnw.com/00407 is also 4 mins from
Roads End Lighthouse (sleeps 11) http://www.beachcombersnw.com/01176
Oregon Beach Vacations
1.800.723.2383
Email: obv@oregonbeachvacations.com

Anna’s & Pacific Villa
http://www.orshores.com/ss-detail.php?property=129
More info: (cut & paste)
http://www.orshores.com/search-results.php?occupancy=&property_type=Side+by+Side+Homes&Submit=Submit
Oregon Shores Vacation Rentals
1.800.800.7108
Email: reservations@orshores.com

Depoe Bay area
Explorations (sleeps 10) http://www.beachcombersnw.com/01173
is only 4 mins away from Mina House (sleeps 12)
http://www.beachcombersnw.com/01312

I will be adding more soon. Please let me know if you need more info?