EXHIBIT 21

FIRSTBANK CORPORATION SUBSIDIARIES

NAME	STATE OF INCORPORATION	OWNERSHIP
Firstbank – Alma	Michigan		100%
Firstbank (Mt. Pleasant)	Michigan		100%
Firstbank – West Branch	Michigan		100%
Firstbank – Lakeview	Michigan		100%
Firstbank – St. Johns	Michigan		100%
Keystone Community Bank	Michigan		100%
1st Armored, Inc.	Michigan		100% by Firstbank – West Branch
1st Title, Inc.	Michigan		100% by Firstbank – West Branch
Firstbank – Alma Mortgage Company	Michigan		100% by Firstbank – Alma
Firstbank (Mt. Pleasant) Mortgage Company	Michigan		100% by Firstbank Mt. Pleasant
Firstbank – West Branch Mortgage Company	Michigan		100% by Firstbank – West Branch
Firstbank – Lakeview Mortgage Company	Michigan		100% by Firstbank – Lakeview
Firstbank – St. Johns Mortgage Company	Michigan		100% by Firstbank – St. Johns
Keystone Mortgage Services, LLC	Michigan		99% by Keystone Community Bank and 1% by Firstbank Corporation
Keystone Premium Finance	Michigan		90% by Keystone Community Bank and 10% by Keystone Mortgage Services, LLC
Keystone T.I. Sub, LLC	Michigan		100% owned by Keystone Community Bank
KCB Title Insurance Agency, LLC	Michigan		50% owned by Keystone T.I. Sub, LLC
1st Investors Title, LLC	Michigan		52% owned by 1st Title, Inc.
FBMI Risk Management Services, Inc.	Nevada		100%
Firstbank – West Michigan	Michigan		100%
ICNB Mortgage Company, LLP	Michigan		99% by Firstbank – West Michigan and 1% by Firstbank Corporation
First Investment Center	Michigan		100% by Firstbank – West Michigan
Austin Mortgage Company, Inc	Michigan		100% by Firstbank Corporation