Here are some links to research on congregations:

The State of the Church in America: Hint: It’s not Dying by Ed Stetzer – a helpful interpretation of the research data

US Congregations data – 

Faith Communities today – Faith Communities Today website and their Facts of Growth report on the change in congregations between 2000-2010.

The Association of Religion Data Archives – 

ELCA by the numbers (June 2012) – Numbers Tell a Tale of Change – Some up, done – always onward by Daniel Lehmann. The Lutheran, June 2012, access at

American Religious Identification Survey 2008 (Click the image below for a link.)