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Sulphur Rock, Arkansas

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Census Data for Sulphur Rock ...

Population ...

The most recent Census Estimate<1> was for 2017 and it gives Sulphur Rock a population of 461 people.

The last Decennial Census<2> was in 2010, giving Sulphur Rock a population of 456 people.

The town of Sulphur Rock is located in Independence County. The 2010 Census gave Independence County a population of 36,647 people. This means that Sulphur Rock had 1.24% of the county's total population, making it Independence's 3rd most populous community.

At the same time, Arkansas had a population of 2,915,918 people, meaning that Sulphur Rock had 0.02% of the total population of Arkansas - making it the state's 283rd most populous community.

Area ...

When the Census Bureau conducts a census for a town like Sulphur Rock, they draw a boundary around the area in which they are going to conduct their count - this is called a sampling area (or a polygon). The shape of the sampling area can be quite complex and it's important to keep in mind that the boundaries of the sampling area may or may not match the recognized boundaries of the town.

Things like the population, area and housing for Sulphur Rock reflect the sampling area. Since the shape of the sampling area and the actual boundaries of Sulphur Rock might be slightly different, it's best to check with the U.S. Census Bureau if you need precision.

The 2010 Census shows that the sample polygon for Sulphur Rock has a total area of 1.27 square miles [3.3 km²].

Independence County has a land area of 763 square miles [1,978.6 km²]. At 1.27 square miles [3.3 km²], Sulphur Rock has 0.17% of the county's total land area.

Not only does the sampling area define boundaries, it also has a GPS location (latitude & longitude) that indicates a point within the sampling area (usually at the center of the polygon). At the time of the 2010 Census, the sampling area was located at:

Lat:   35° 45' 5"   (or 35.75°)             [Map]

Lon:   -91° 30' 0"   (or -91.5°)

More information on this topic and the changes between the 2000 Census and the 2010 Census can be found in the section for our Census-to-Census Observations ... (see below).

Population Density ...

Using the population (456 people) and land area (1.27 square miles [3.3 km²]) values from the 2010 Census, Sulphur Rock had a population density of 357.9 people per square mile [138.2 people/km²].

In comparison, the 2000 Census shows Sulphur Rock had a population of 421 people and a land area of 1.28 square miles [3.3 km²]. This gives a population density of 328.6 people per square mile [126.9 people/km²]

NOTE: Be aware that when comparing population density between the 2000 and the 2010 Census, there were changes in the sampling area for Sulphur Rock. You need to be careful when making such a comparison, the differences are likely to lead to a misleading comparison. More information about the nature of these changes can be found in the section Census-to-Census Observations ... (see below).

Housing Units ...

At the time of the 2010 Census, Sulphur Rock had 220 Housing Units<3> and with its population of 456 people, this averages 2.07 people per Housing Unit.

The 2010 Census shows Sulphur Rock had a land area of 1.27 square miles [3.3 km²]. This translates to 172.7 Housing Units per square mile [66.7 housing units/km²].

From the Census of 2000: Sulphur Rock had 178 Housing Units, a population of 421 people and a land area of 1.28 square miles [3.3 km²]. This gives a density of 2.37 people per Housing Unit and 138.9 Housing Units per square mile [53.6 housing units/km²].

NOTE: Repeating the caution above (under Population Density), be aware that when comparing Housing Units between the 2000 and the 2010 Census, there were changes in the sampling area for Sulphur Rock and you need to be careful when comparing results between the censuses. More information about the nature of these the changes can be found in the section called Census-to-Census Observations ... (see below).

Independence County ...

The community of Sulphur Rock is located in Independence County.

The county had a population of 36,647 people at the 2010 Census. With it's population of 456 people, Sulphur Rock represented 1.24% of the county's total.

In addition, where the town of Sulphur Rock has a population density of 357.9 people per square mile [138.2 people/km²], Independence County averages 47.97 people per square mile [18.52 people/km²].

For more information, please visit our Census Page for Independence County.

Population Rings for Sulphur Rock ...

To help identify the number of people who live in Sulphur Rock and the surrounding area, we have drawn concentric rings centered on Sulphur Rock. We counted the number of communities within each ring and summed their populations.<4>

  Radius   No of
  Since 2010    
5 mi   [8 km]41,992+1.07%
10 mi   [16 km]612,980+4.01%
15 mi   [24 km]1116,913+2.4%
20 mi   [32 km]1727,495+0.21%
25 mi   [40 km]2730,812-0.25%
30 mi   [48 km]3334,851-0.36%

Census-to-Census Observations ...

Introduction ...

When the Census Bureau takes a census count (or enumeration) for Sulphur Rock, they start by specifying the boundaries of the area to be counted. This area (or sampling area) is a polygon and its shape can be quite complex - it may or may not match the geographical boundaries of Sulphur Rock. It's important to note that from one Census to the next, the shape and location of the polygon can change. If you need precision or details about the methodology of the Census, you should visit the U.S. Census Bureau for a definitive answer.

Area ...

The sampling area (or polygon) given for the 2010 Census is 0.56% smaller than the 2000 Census.

The 2010 Census shows that the total area for Sulphur Rock was 1.27 square miles [3.3 km²]. Of this total, only a minor amount of the area is covered by water.

The 2000 Census shows a total area of 1.28 square miles [3.3 km²]. Of this total, only a minor amount of the area is covered by water.

Location ...

While generally coinciding with the GPS location (latitude/longitude) of Sulphur Rock, the latitude and longitude given by the Census Bureau actually indicates the GPS location of the polygon for Sulphur Rock.

For the 2010 Census, the location was given as:

Lat:   35.751623°   (or 35°45'5" N)             [Map]

Lon:   -91.500105°   (or -91°30'0" W)

For the 2000 Census, the location given was:

Lat:   35.752009°   (or 35°45'7" N)             [Map]

Lon:   -91.501807°   (or -91°30'6" W)

The difference indicates that the U.S. Census Bureau moved the location of the polygon for the 2010 Census 522 feet to the east<5> of the location that was used in the 2000 Census.

The U.S. Geological Survey (USGS) and the U.S. Board on Geographic Names (BGN) have assigned a unique GNIS identifier (#2406680) to Sulphur Rock. This identifier also marks a GSP point on the map, and that point lies within the boundaries of Sulphur Rock. The GNIS point has been mapped to the latitude/longitude:

Lat:   35.751685°   (or 35°45'6" N)             [Map]

Lon:   -91.500084°   (or -91°30'0" W)

The GSP location given for the 2010 Census lies 23.44 feet to the south<6> of the point given by the GNIS for Sulphur Rock. For more information about this and the relationship of the various Federal Codes, please visit our Misc Page for Sulphur Rock.

Miscellaneous Information for Sulphur Rock ...

The Federal government has assigned various identifying codes to each community, county and state. At one time or another, the US Census Bureau has referenced one (or more) of the following identifiers when referring to either Independence County or the town of Sulphur Rock:

The GNIS Codes ...

The current system of identification is called the Geographic Names Information System (GNIS). The following GNIS codes relate to Sulphur Rock:

GNIS ID for Sulphur Rock: 2406680

GNIS ID for Independence County: 69163

GNIS ID for Arkansas: 68085

The FIPS Codes ...

An earlier (and largely obsolete) identification method was called the Federal Information Processing Standard (FIPS):

State Code: 05 (Arkansas)

County Code: 063 (Independence County)

Place Code: 67730 (Sulphur Rock)

State & County Code: 05/063 (Arkansas / Independence County)

State & Place Code: 05/67730 (Arkansas / Sulphur Rock)

Misc. Census Codes ...

Sulphur Rock is located in Census Region #3 (the South Region) and Division #7 (the West South-Central Division).

The US Postal Service ZIP Code ...

While some people have used a ZIP code to identify a community, the purpose of the ZIP code was to make mail delivery more efficient by grouping addresses together. Although the ZIP Code doesn't specifically identify a town like Sulphur Rock, it does identify addresses that are in (or near) Sulphur Rock. It's important to remember that the boundaries of a ZIP Code can be changed, re-assigned or overlapped with other ZIP Codes.

The ZIP code for Sulphur Rock: 72579<7>

Census ZCTA Codes ...

The US Census Bureau created statistical entities that they call ZIP Code Tabulation Areas (ZCTAs) and these ZCTAs are frequently confused with the ZIP codes that come from the US Postal Service (USPS).

ZCTAs were first created for the 2000 Census and at that time, they were based upon the USPS ZIP codes. While largely covering the same areas, the boundaries of a ZCTA do not necessarily match the boundaries of a postal ZIP code with the same number. For example, while a postal ZIP code can cross a county or state line, a Census ZCTA can not. They should be treated as separate entities with no correlation between them.

For more information about the various Federal identification codes, please visit our Misc Page for Sulphur Rock.

Other Roadside Stops ...

Find a Community in Arkansas

About Independence County

About Arkansas

Off-the-Road Links ...

The official website of the U.S. Census Bureau

Unfortunately, we don't know of a website for Sulphur Rock. If you can help, please contact us through our Feedback Page.

The official website for State of Arkansas:

The official website of the U.S. Board on Geographic Names (BGN)

The official website of the U.S. Geological Survey (USGS)

Footnotes ...

<1>Every year, the US Census Bureau creates a population estimate for the preceeding year. Keep in mind that this value is an estimate and not an actual count. The most recent Census estimate is for the year 2017.

- Return to Citation

<2>Every 10 years (eg- 1990, 2000, 2010), the US Census Bureau conducts a Constitutionally-mandated count (or enumeration) of people living within the United States. This count is called a Decennial Census. The last Decennial Census was the 2010 Census, with the next one planned for 2020.

- Return to Citation

<3>A Housing Unit is a broad term for those places where people live (whether occupied or temporarily vacant), such as a house, an apartment, a mobile home, or an area that is considered as a separate living quarter. Separate living quarters (consisting of one or more rooms) are considered to be those places where people live, sleep and eat separately from others and that have access to the outside (either directly or by a shared hallway).

- Return to Citation

<4>The communities in our count are those provided by the 2010 Census, so keep in mind that our population rings will only include the people living in those communities. Smaller communities usually don't participate directly in the Census and therefore they won't be included. While our count is a close approximation, it shouldn't be considered as a complete or accurate count.

- Return to Citation

<5>The calculated bearing (or angle) to the 2010 Census location is 254 degrees and a distance of 522 feet.

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<6>The calculated bearing (or angle) to the GNIS point is 164 degrees and a distance of 23.44 feet.

- Return to Citation

<7>When looking for a ZIP Code, whether Sulphur Rock or elsewhere, it's always best to check the website of the United States Postal Service (USPS).

- Return to Citation


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This page was last modified: 15 Oct 2018
By John Hall