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Oakville, Iowa

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The location of Oakville

Census Data for Oakville ...

Population ...

The most recent Census Estimate<1> was for 2018 and it gave Oakville a population of 173 people.

The last Decennial Census<2> was in 2010, which gave Oakville a population of 173 people.

The city of Oakville is located in Louisa County. The 2010 Census gave Louisa County a population of 11,387 people. This means that Oakville had 1.52% of the county's total population, making it Louisa's 8th most populous community.

At the same time, Iowa had a population of 3,046,355 people.

Area ...

When the Census Bureau conducts a census for a city like Oakville, they draw a boundary around the area in which they are going to conduct their count - this defines the sampling area (usually shaped as 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 city.

Things like the population, area and housing for Oakville reflect the sampling area. Since the shape of the sampling area and the actual boundaries of Oakville might be different, it's best to check with the U.S. Census Bureau to resolve any difference between the two.

The 2010 Census shows that the sampling area for Oakville has a total area of 0.42 square miles [1.1 km²]. Of this total, 0.42 square miles [1.1 km²] is land, with the balance (1.18%) being water (0 square miles [0 km²]).

Louisa County has a land area of 401.8 square miles [1,040.6 km²]. At 0.42 square miles [1.1 km²], Oakville has 0.1% 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 the center of the polygon, known as the centroid). At the time of the 2010 Census, the sampling area was located at:

Lat:   41° 5' 52"   (or 41.1°)             [Map]

Lon:   -91° 2' 37"   (or -91.04°)

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 (173 people) and land area (0.42 square miles [1.1 km²]) values from the 2010 Census, Oakville had a population density of 408 people per square mile [157.5 people/km²].

In comparison, the 2000 Census shows Oakville had a population of 439 people and a land area of 0.42 square miles [1.1 km²]. This gives a population density of 1,032 people per square mile [398.7 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 Oakville. You need to be careful when making such a comparison, the differences are likely to lead to a misleading comparison. More information about the changes can be found in the section Census-to-Census Observations ... (see below).

Housing Units ...

At the time of the 2010 Census, Oakville had 95 Housing Units<3> and with its population of 173 people, this averages 1.82 people per Housing Unit.

The 2010 Census shows Oakville had a land area of 0.42 square miles [1.1 km²]. This translates to 224.1 Housing Units per square mile [86.5 housing units/km²].

From the Census of 2000: Oakville had 193 Housing Units, a population of 439 people and a land area of 0.42 square miles [1.1 km²]. This gives a density of 2.27 people per Housing Unit and 454 Housing Units per square mile [175.3 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 Oakville and you need to be careful when comparing results between the censuses. More information about these differences can be found in the section called Census-to-Census Observations ... (see below).

Louisa County ...

The community of Oakville is located in Louisa County.

The county had a population of 11,387 people at the 2010 Census. With it's population of 173 people, Oakville represented 1.52% of the county's total.

In addition, where the city of Oakville has a population density of 408 people per square mile [157.5 people/km²], Louisa County averages 28.34 people per square mile [10.94 people/km²].

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

Population Rings for Oakville ...

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

  Radius   No of
  Since 2010    
5 mi   [8 km]31,403-4.23%
10 mi   [16 km]76,154-3.01%
15 mi   [24 km]108,154-4%
20 mi   [32 km]2345,187-3.37%
25 mi   [40 km]3786,009-1.68%
30 mi   [48 km]4799,327-1.47%

Census-to-Census Observations ...

Introduction ...

When the Census Bureau takes a census count (or enumeration) for Oakville, 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 Oakville. 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 ...

There is only a very minor difference in the sampling area given between the 2010 Census and the 2000 Census.

The 2010 Census shows that the total area for Oakville was 0.42 square miles [1.1 km²]. Of this total, 0.42 square miles [1.1 km²] is land, with the balance (1.18%) being water (0 square miles [0 km²]).

The 2000 Census shows a total area of 0.43 square miles [1.1 km²]. Of this total, 0.42 square miles [1.1 km²] is land, with the balance (1.16%) being water (0 square miles [0 km²]).

Location ...

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

For the 2010 Census, the location was given as:

Lat:   41.097988°   (or 41°5'52" N)             [Map]

Lon:   -91.043790°   (or -91°2'37" W)

For the 2000 Census, the location given was:

Lat:   41.097853°   (or 41°5'52" N)             [Map]

Lon:   -91.043625°   (or -91°2'37" W)

The difference indicates that the U.S. Census Bureau moved the location of the polygon for the 2010 Census 66.9 feet to the northwest<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 (#2395294) to Oakville. This identifier also marks a GSP point on the map, and that point lies within the boundaries of Oakville. The GNIS point has been mapped to the latitude/longitude:

Lat:   41.098115°   (or 41°5'53" N)             [Map]

Lon:   -91.043617°   (or -91°2'37" W)

The GSP location given for the 2010 Census lies 66.4 feet to the southwest<6> of the point given by the GNIS for Oakville. For more information about this and the relationship of the various Federal Codes, please visit our Misc Page for Oakville.

Miscellaneous Information for Oakville ...

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

The GNIS Codes ...

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

GNIS ID for Oakville: 2395294

GNIS ID for Louisa County: 465246

GNIS ID for Iowa: 1779785

The FIPS Codes ...

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

State Code: 19 (Iowa)

County Code: 115 (Louisa County)

Place Code: 58395 (Oakville)

State & County Code: 19/115 (Iowa / Louisa County)

State & Place Code: 19/58395 (Iowa / Oakville)

Misc. Census Codes ...

Oakville is located in Census Region #2 (the Midwest Region) and Division #4 (the West North-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 city like Oakville, it does identify addresses that are in (or near) Oakville. 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 Oakville: 52646<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 Oakville.

Other Roadside Stops ...

Search for a Iowa Community

About Louisa County

About Iowa

Off-the-Road Links ...

The official website of the U.S. Census Bureau

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

The official website for Louisa County:

The official website for State of Iowa:

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 2018.

- 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 42 degrees and a distance of 66.9 feet.

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<6>The calculated bearing (or angle) to the GNIS point is 134 degrees and a distance of 66.4 feet.

- Return to Citation

<7>When looking for a ZIP Code, whether Oakville 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: 27 Aug 2019