fin.codes

Comerica → Fifth Third: what changes for your money

The specifics this page promised to watch for are now published: Fifth Third converts Comerica accounts to its systems on Tuesday, September 8, 2026, and its own Welcome Center says existing account and routing numbers for checking and savings continue to work. comerica.com still prints its state routing table, and all four numbers are Bank-verified here with a screenshot re-captured August 2, 2026.

What to know

  • Comerica's routing numbers are still current: comerica.com's own table assigns one number by the state where you opened the account — all four Bank-verified here, re-captured August 2, 2026.
  • Fifth Third's Welcome Center answers the routing question directly: after the September 8 conversion, "your existing account and routing numbers for checking and savings accounts and Comerica debit card and checks will continue to work."
  • One number per state where the account was opened, not where you live now — Arizona and California share 121137522.
  • Over the September 4–7 conversion weekend, expect brief interruptions to Comerica online and mobile banking. Fifth Third says direct deposits, scheduled payments, debit cards, checks, and ATMs keep working throughout.
  • Fifth Third's continue-to-work statement covers consumer checking and savings accounts. Business, commercial, and private banking customers follow their own transition tracks on 53.com — confirm details there before the conversion.

How it happened

  1. October 6, 2025 — Fifth Third and Comerica announce a definitive merger agreement — an all-stock deal valued at $10.9 billion, creating "the 9th largest U.S. bank." (Joint release (SEC 8-K exhibit))
  2. January 6, 2026 — Shareholders of both companies approve the merger (99.7% of Fifth Third votes, 97.0% of Comerica votes cast in favor). (Joint release (SEC 8-K exhibit))
  3. January 13, 2026 — The Federal Reserve approves the combination: "customers at both banks will see little change in their day-to-day business, and Comerica locations will continue to operate under the Comerica brand." (Joint release (SEC 8-K exhibit))
  4. February 1, 2026 — The merger closes — the FDIC records Comerica Bank's charter (CERT 983) merging into Fifth Third; the combined bank is "the ninth-largest U.S. bank with approximately $294 billion in assets." (Completion release (SEC 8-K exhibit) + FDIC record)
  5. July 31, 2026 — Fifth Third sets the date: Welcome Packages start arriving with personalized account details, and the release states the conversion "is completed on September 8." Online and mobile login information follows by mail in late August. (Fifth Third press release, July 31, 2026 (53.com))
  6. Sept 8, 2026 (scheduled) — Conversion day. Fifth Third's Welcome Center: "Keep banking as you do today — your existing account and routing numbers for checking and savings accounts and Comerica debit card and checks will continue to work, as will your direct deposits and scheduled payments." Expect brief interruptions to Comerica online and mobile banking over the September 4–7 conversion weekend. (Welcome to Fifth Third — the conversion timeline (53.com))

Comerica + Fifth Third questions

Is Comerica now part of Fifth Third?

Yes — the merger closed February 1, 2026, per the FDIC's charter record and both companies' announcements. Comerica keeps operating under the Comerica brand until the full system and brand conversion, which Fifth Third has now scheduled for Tuesday, September 8, 2026.

Did Comerica's routing numbers change?

No. As of August 2, 2026, comerica.com still publishes its own routing-number table — one number per state where the account was opened — and we've re-verified all four numbers against that page with a fresh screenshot. Fifth Third's Welcome Center says the numbers continue to work after the September 8 conversion.

Will my Comerica routing number change after the conversion?

Fifth Third's own Welcome Center now answers this: after the September 8, 2026 conversion, 'your existing account and routing numbers for checking and savings accounts and Comerica debit card and checks will continue to work,' along with direct deposits and scheduled payments. That statement covers consumer checking and savings; business and commercial customers should confirm on their own transition pages. As ever, treat any 'your numbers changed' message that doesn't come from the bank itself as suspect.

Which Comerica routing number do I use?

The one for the state where you opened your account, per Comerica's own page: Arizona and California use 121137522, Florida 067012099, Michigan 072000096, and Texas 111000753. For accounts opened in other states, Comerica's page says to contact the bank.

What should Comerica customers do right now?

Per Fifth Third: nothing is required. Welcome Packages with personalized account details arrive by mail in early August 2026, online and mobile login information follows in late August, and the conversion completes September 8. Expect brief interruptions to Comerica online and mobile banking over the September 4–7 weekend. The sensible habit stands: confirm routing and account details in the app before any new deposit or wire around the conversion window.

What we checked, and when

Routing data is sourced from official bank pages, FDIC and NCUA institution data, and public routing directories, current in this build as of August 2, 2026. Confirm routing or SWIFT details with the financial institution before sending money.