Credit Unions in Groton, CT

Credit Unions in Groton, CT: 8 branches on record from 4 federally insured institutions, spread over 2 ZIP codes. Addresses come straight from the federal branch files.

What the branch files show in Groton, CT

Branches on file
8
Institutions present
4
ZIP codes covered
2
Furthest two branches
Not mapped

Groton has 8 credit union branches on file across 4 institutions, and Coreplus Credit Union accounts for 3 of them (38% of the city’s total). 1 of those institutions keep a single office here. 3 are headquartered inside Connecticut.

The records carry 8 street addresses and 0 mapped coordinates. Branch ZIP codes on file: 06340, 06349.

The institutions serving Groton were chartered between 1936 and 1976.

The federal files list addresses, not opening hours, so we do not publish hours for these branches. Check the institution’s own branch page before travelling.

InstitutionBranches in GrotonOffices nationwideHeadquartersChartered
Coreplus Credit Union312Norwich, CT1936
Charter Oak Credit Union215Waterford, CT1939
Navy Federal Credit Union2359Vienna, VA1947
America'S First Network Credit Union111East Hartford, CT1976

Primary sources

  • NCUAQuarterly Call Report FOICU/FS220 files (CU_NUMBER key) · observed quarterly call reports, 2026 Q1

Institution records as of 2026-03-31.

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Frequently asked questions

Can anyone join a credit union?

Not automatically. Each one has a field of membership, though many now include a low-cost association route that opens eligibility to anyone.

Are credit union deposits insured?

Federally insured credit unions are covered by the NCUA Share Insurance Fund to $250,000 per member, per ownership category.

What the credit unions in Groton figures actually show

Start with one distinction: what we publish for Groton, CT are medians, not averages.

A median is the midpoint: half of the local market sits above it and half below. Averages get dragged around by a handful of extreme values — one very expensive property, one unusually large loan, one graduate earning far more than their classmates — so a median is the safer number to plan against. Locations on record of 8 and institutions represented of 4.

Treat these as a baseline for picking a branch or an institution to bank with, not a quote. Your own position depends on details no dataset holds: credit history, the exact street, the specific product on offer this week.

Turning the Groton, CT data into a decision

Context does most of the work here. A number is only high or low next to something else, so we publish Groton, CT and how it sits inside Connecticut against a wider benchmark on the same measure. State of Connecticut.

A difference of a few percent is inside the survey's own margin of error. A difference of a quarter or more is real, and it normally reflects the housing mix, the dominant local industries, or how much of the population is retired rather than working.

The useful habit is to pair every figure with the cost it has to cover. Income against rent, loan size against income, price against what the same money buys one county over.

Where Groton, CT sits against the wider market

Comparison is the fastest way to tell a genuinely unusual local market from an ordinary one. We benchmark Groton, CT against Connecticut and against the national picture on the same definitions, in the same period, so the difference you see is a real difference rather than an artefact of two datasets disagreeing.

Watch the denominator whenever a comparison surprises you. Whether a rate is calculated on all applications or only completed ones, on every unit or only those on the market, changes the answer more than the local market does.

When the underlying sample is too small for a reliable estimate, we publish nothing for that measure rather than modelling a plausible-looking figure. Fewer numbers you can trust beats more you cannot.

What to check before you commit

None of this needs a spreadsheet. It needs the discipline of checking the same handful of things every time, whether you are picking a branch or an institution to bank with for the first time or the fifth.

  • Verify the branch is still open and staffed before you travel; registers lag closures by a quarter or more.
  • Check whether deposit insurance covers your full balance, and how joint accounts change that limit.
  • Check the fee schedule and the fine print, not the headline rate — that is where the real cost usually hides.
  • Ask what the number looks like in a bad year, not an average one, and make sure the plan still holds.
  • Write down the monthly number you can genuinely cover, not the maximum a lender or admissions office says you qualify for.
  • Compare at least three offers. Pricing on the same product varies more between providers than most people expect, and the gap is yours to keep.

Questions people ask about Groton, CT

How current is the credit unions in Groton data?

The figures come from the most recent release of the FDIC office file and the NCUA credit union branch file, and we refresh the page when a new one is published. Public datasets run a reporting lag of several months to two years, so the latest available period is not the same as today.

Why does another site show a different number for Groton, CT?

Almost always because it is measuring something slightly different, or using an earlier release. Check the definition and the period before assuming one of the two is wrong; federal branch and office registers publish several near-identical measures with meaningfully different scopes.

Can I use this for picking a branch or an institution to bank with?

As a benchmark, yes — it tells you whether an offer or an asking price is normal for this local market. As a substitute for your own quote or estimate, no. Locations on record of 8.

Method and limitations

The page is assembled from federal branch and office registers, specifically the FDIC office file and the NCUA credit union branch file. Nothing here is modelled from a proprietary black box: every figure traces to a published record, and where we derive a ratio we show both inputs so the arithmetic can be checked.

Be aware of what the data cannot do. Small-area estimates are noisier than headline national ones, every source reports on a delay, and no median describes the outliers that people most often remember.

Where a source revises a figure, the revised value replaces the old one rather than sitting alongside it, so the page always reflects the current official position. If you spot a number that looks wrong, it is worth telling us — corrections get made against the source record, not by guesswork.

Other cities in Connecticut

Methodology

The 8 branches listed for Groton come from the federal branch files, filtered to Groton, CT and matched to the 4 institutions we hold profiles for.

8 of the 8 Groton records carry a street address and 0 carry coordinates, which is how the 0-mile spread and the ZIP list above are worked out.

Coreplus Credit Union is the largest presence in Groton with 3 of the 8 branches; figures per institution are on its own profile page.

Sources: FDIC institution and office files; NCUA call report. American Community Survey 5-year estimates, 2022.