Jacksonville or St. Johns County? Why Buying Across the County Line Can Change Your Homeownership Budget

Northeast Florida homebuyers usually narrow their search to two neighbors: Duval County (Jacksonville) and St. Johns County. They sit side by side, share the same coastline, and belong to the same metro - but crossing that county line can reshape your monthly budget more than any renovation or rate lock.

The July 2026 Snapshot


Metric	Duval County (Jacksonville)	St. Johns County
Median home price	$305,000–$330,000	$513,000–$600,000
Typical days on market	50–60 days	30–55 days
Effective property tax rate	~1.15%–1.2%	~0.93%–0.95%
CDD fees	Rare (a few pockets, e.g. eTown)	Common in master-planned communities
Avg. insurance premium	$2,800–$3,800+/yr	$2,800–$3,800+/yr (lower in newer builds)

The Property Tax Paradox

St. Johns' lower rate doesn't mean a lower bill - its home values are high enough to erase the discount:

$330,000 Duval home at ~1.18% effective rate → ~$3,900/year
$550,000 St. Johns home at ~0.94% effective rate → ~$5,170/year

2026 wildcard: Florida voters decide a constitutional amendment (HJR 1-F) on the November 3, 2026 ballot. If it passes with 60% approval, the homestead exemption for non-school taxes rises to $150,000 in 2027 and $250,000 in 2028. Buyers who establish residency before January 1, 2027 benefit soonest - those moving in after face a five-year wait.

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CDD Fees: St. Johns' Hidden Line Item

Nocatee, SilverLeaf, and Shearwater all carry Community Development District (CDD) fees on top of HOA dues
Typically adds $1,000–$3,500+ per year to fund roads, pools, and amenities
Duval has a few CDD pockets (like eTown), but most established neighborhoods run standard, lower-cost HOAs only

Insurance: Age of Housing Stock Matters

Duval: older stock in established areas like Riverside and San Marco can mean flood-zone reviews and roof-age requirements
St. Johns: newer construction often qualifies for hurricane-code discounts
Exception: coastal pockets like Ponte Vedra Beach carry higher premiums regardless of build year

Which County Fits Your Budget?

Choose Jacksonville (Duval) if you want:

A lower entry price
Established neighborhoods without CDD fees - see our guide to Jacksonville's best suburbs for options
Total monthly carrying cost closer to $1,700–$2,000

Choose St. Johns County if you want:

Newer construction in an amenity-rich community
Highly rated public schools
A budget that comfortably supports $2,300+/month

Either way, running the full math - price, taxes, CDD fees, insurance, and the pending ballot measure - before you make an offer tells you more about your true monthly cost than the county line ever will.

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