What city is 45503 in?

45503 is a Springfield, OH mailing address. By land area, 45% lies inside Springfield and 11% lies inside Northridge; the rest is outside any Census-defined city or community.

What is the population of 45503?

About 32,638 people (±1,267), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 32,870.

What is the median household income in 45503?

$59,595 (±$3,668), compared with $71,389 for Ohio as a whole. Half the households in the ZIP code earn more and half earn less.

How many carrier routes and mailboxes are in 45503?

24 USPS carrier routes with 14,784 residential and 611 business mailboxes (15,395 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.

What ZIP codes are near 45503?

The closest, measured center to center: 45501 (3.4 mi, Springfield), 45505 (4.4 mi, Springfield), 45372 (5 mi, Tremont City), 45504 (5.3 mi, Springfield), 45506 (5.4 mi, Springfield) and 45502 (7.4 mi, Springfield).

45503 ZIP Code, Springfield, OH

45503 is a ZIP code in Springfield, Ohio in Clark County. It covers 17 square miles of land. The closest ZIP codes are 45501, 45505 and 45372. 32,638 people live here in 14,202 households, more than in 9 of every 10 Ohio ZIP codes. At about 1,869 people per square mile it has suburban density, and owners and renters are mixed (61% own). Median household income is $59,595, below the Ohio median of $71,389.

Quick facts

Mailing city: Springfield, OH
County: Clark County
Land area: 17 sq mi
Population: 32,638
Median household income: $59,595
Carrier routes: 24 (14,784 homes)

Key figures

Measure	Value
Residents	32,638
Households	14,202
Median household income	$59,595
Income per person	$33,336
Median age	41.1
Homeowners	60.8%
Median home value	$168,200
Median rent	$892
Bachelor's degree or higher	19.8%
Average commute (minutes)	23.3
Households with kids under 18	30.1%
Moved in the past year	16.5%
Below the poverty line	15.8%
Broadband internet	91.0%
Speak a non-English language at home	4.2%

Household income

% of households	Value
<$10K	4.7%
$10–15K	5.1%
$15–25K	7.4%
$25–35K	12.5%
$35–50K	12.4%
$50–75K	19.9%
$75–100K	13.8%
$100–150K	16.3%
$150–200K	3.7%
$200K+	4.2%

Age

% of all residents	Value
<10	13.0%
10–19	11.2%
20–24	5.2%
25–34	13.6%
35–44	11.0%
45–54	12.7%
55–64	11.9%
65–74	11.8%
75+	9.6%

Tenure

% of housing units	Value
Owned, with mortgage	34.0%
Owned outright	22.5%
Rented	35.8%
Vacant	7.7%

Type of building

% of housing units	Value
Detached house	65.4%
Townhome	8.1%
2–4 units	7.7%
5–19 units	11.1%
20+ units	6.7%
Mobile / other	0.8%

Businesses in 45503

450 business establishments with 7,084 employees (ZIP Codes Business Patterns 2023).

Health Care and Social Assistance: 83
Retail Trade: 71
Accommodation and Food Services: 57
Other Services (except Public Administration): 51
Professional, Scientific, and Technical Services: 40
Finance and Insurance: 34
Real Estate and Rental and Leasing: 18
Manufacturing: 17

EDDM carrier routes

45503 has 24 USPS carrier routes with 14,784 residential and 611 business mailboxes. Open the EDDM route map.

Carrier routes in 45503

45503 has 24 USPS carrier routes (24 city (C)) with 14,784 residential and 611 business mailboxes. Routes range from 394 homes (C084) to 855 homes (C058); the median route has 618 homes. The Census counted 14,202 households in 45503 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per route	Routes
1–249	0
250–499	5
500–749	17
750–999	2
1,000–1,499	0
1,500+	0

Best routes in 45503 for…

Most businesses

For B2B offers: office supplies, cleaning, IT, catering and commercial services.

Route C079 — USPS business mailboxes 98, 658 homes
Route C022 — USPS business mailboxes 80, 460 homes
Route C062 — USPS business mailboxes 68, 510 homes
Route C085 — USPS business mailboxes 62, 572 homes
Route C009 — USPS business mailboxes 61, 698 homes

Select these 5 routes on the route map

Every carrier route in 45503

Route	Type	Homes	Businesses	Est. median income	Est. owners	Est. families with kids	Est. moved in past year
C001	City	652	4	$67,127	—	—	—
C002	City	572	31	$50,748	—	—	—
C003	City	525	0	$64,299	—	—	—
C007	City	707	14	$28,654	—	—	—
C009	City	698	61	$40,911	—	—	—
C022	City	460	80	$25,950	—	—	—
C040	City	583	18	$62,766	—	—	—
C048	City	668	13	$41,566	—	—	—
C058	City	855	25	$73,392	—	—	—
C060	City	739	20	$41,913	—	—	—
C062	City	510	68	$68,997	—	—	—
C064	City	743	4	$44,967	—	—	—
C065	City	694	1	$67,127	—	—	—
C067	City	678	6	$53,605	—	—	—
C068	City	484	13	$64,299	—	—	—
C073	City	449	3	$55,252	—	—	—
C075	City	741	10	$72,074	—	—	—
C076	City	498	3	$62,766	—	—	—
C079	City	658	98	$46,827	—	—	—
C080	City	581	9	$120,060	—	—	—
C083	City	821	15	$53,605	—	—	—
C084	City	394	53	$55,990	—	—	—
C085	City	572	62	$35,308	—	—	—
C087	City	502	0	$78,947	—	—	—

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 45503 on the EDDM route map.

How route demographics are estimated

Mailbox counts come from USPS; demographics are estimates

The number of homes and businesses on each carrier route is the current USPS EDDM count. The Census Bureau does not publish figures for carrier routes, so income, homeownership, ages, families, movers and housing age on a route are EDDM2GO estimates built from Census block groups (neighborhood areas of roughly 600 to 3,000 people).

How a route gets its figures: the block-group length-share method

We trace each route's streets every 25 meters and record which block group each stretch falls in. The route's homes are spread along its streets in proportion to length, so a route with 60% of its street length in one block group is assumed to have 60% of its homes there. Each block group then contributes its Census counts in proportion to the share of its housing units that sit on the route (capped at the whole block group). Medians are recalculated from the combined income, home-value and age brackets, the way the Census Bureau computes them, not averaged.

Margins of error

Census survey figures carry a margin of error at 90% confidence; we carry it through the calculation and show it as ±. Our margins treat the route-to-block-group split as exact, so the real uncertainty is larger. Routes with fewer than 100 estimated households, large margins, or streets we could not place are flagged.

Different years

USPS mailbox counts are current. Census figures are 5-year averages for 2020–2024, so a new subdivision may have more homes on the route today than the Census counted. Use the route figures to compare routes with each other, not as an exact head count.

Why some routes show identical figures

Two routes that run through the same block group get the same percentages and medians, because the Census publishes one set of figures for the whole block group. Their mailbox counts still differ, and those are exact.

Route and mailbox counts: USPS EDDM route data. Route demographics: EDDM2GO estimates from U.S. Census Bureau American Community Survey 5-year block-group data (2020–2024) and 2024 cartographic block-group boundaries. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.

Nearby ZIP codes

45501 — Springfield city, OH (3.4 mi)
45505 — Springfield city, OH (4.4 mi)
45372 — Tremont City village, OH (5 mi)
45504 — Springfield city, OH (5.3 mi)
45506 — Springfield city, OH (5.4 mi)
45502 — Springfield city, OH (7.4 mi)
43010 — Catawba village, OH (8.1 mi)
45369 — South Vienna village, OH (9.2 mi)

Areas that include 45503

Where it ranks

Mail every home in 45503

Route counts on this page price as Full Service 6.5 × 9 postcards: we print, bundle by carrier route and hand the mailing to USPS. Prefer to take it to the Post Office yourself? Print only costs less and you pay postage at drop-off.

EDDM guides

ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 45503, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 45503 in?: 45503 is a Springfield, OH mailing address. By land area, 45% lies inside Springfield and 11% lies inside Northridge; the rest is outside any Census-defined city or community.
What county is 45503 in?: 45503 is in Clark County.
What is the population of 45503?: About 32,638 people (±1,267), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 32,870.
What is the median household income in 45503?: $59,595 (±$3,668), compared with $71,389 for Ohio as a whole. Half the households in the ZIP code earn more and half earn less.
How many carrier routes and mailboxes are in 45503?: 24 USPS carrier routes with 14,784 residential and 611 business mailboxes (15,395 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 45503?: The closest, measured center to center: 45501 (3.4 mi, Springfield), 45505 (4.4 mi, Springfield), 45372 (5 mi, Tremont City), 45504 (5.3 mi, Springfield), 45506 (5.4 mi, Springfield) and 45502 (7.4 mi, Springfield).

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.