Coe Operations US States is a test and training app to improve your knowledge of US State flags, state capitals and your ability to place individual states on a map. It includes links to Kiddle (Kids Encyclopedia Facts) or Wikipedia for further information and is designed to be as intuitive as possible.
The Android installer has been temporarily withdrawn while examining an issue with backspacing on some devices. Click the icon above to play in your web browser.
The following examples and screen shots are from the US States parent app, World Flags, which apart from the data and resource files is exactly the same.
There are two views, Flag View and Map View where you can learn or test your knowledge of different states' locations. Click the button to switch views except in Flash Test Mode.
There are two modes, Display Mode that shows states and their state capitals and Test Mode. Display Mode comprises hyperlinks from the flags, maps and state capitals to their respective Kiddle (Kids Encyclopedia Facts) or Wikipedia pages. Kiddle is the initial option for juniors, toggle the bottom right hand button for Wikipedia.
Display Mode has a Play button to move on every seven and a half seconds, so the screen stays on because of its slideshow characteristics in the Android app and in most browsers. Do not leave your device unattended as it could drain the battery. You will be asked however whether you are still watching after 10 minutes of inactivity.
You can type single characters with Quick Select to jump to states beginning with that letter or to the next available option, rolling over to the first if there are none. You may use the Option List if you prefer to go straight to your chosen destination. Backward and forward buttons are also provided for navigation; the Left and Right Arrow keys can be used instead when viewing on a computer.
US States launches in whichever mode was last used if local storage has been granted. Click the Mode button to cycle between them.
There are two primary test modes for testing your knowledge of state flags or locations, just switch view for either. Switching is discouraged during tests however but can sometimes help as a prompt if you're stuck. Tests should be conducted in portrait orientation on moble devices to accommodate the virtual keyboard.
There are three further test options, 10 random questions or all fifty states, a City option for testing your knowledge of state capitals plus Flash Test Mode for accomplished users wanting an extra challenge. Flash Test Mode flashes flags up for one tenth of a second or maps for a half and is not available for city tests.
The final button is not a test button but, as stated above, is for choosing between Kiddle and Wikipedia for information on countries or their capitals.
You may skip or go back to earlier questions as and when you please. Correct solutions are shown after three wrong answers and may be reviewed at the end of the test. Press the central Stop button to exit the review.
Typing is the preferred input method. Options beginning with entered text are filtered and autocompleted as you type, as shown above and in the following image. Since options are limited to those in the list, you are audibly warned when none exist, most likely the result a typing error, and the offending character is removed. Just accept the free hit if it wasn't a typo.
Press Enter/Go or the central Submit button once filtered to the first or last remaining option, as shown above, to submit that as your answer. No further typing is necessary. Use the Backspace key as usual to correct mistakes.
Abbreviations are accepted in several cases too, CAR for Central African Republic for example, St for Saint, although Saint Vincent and the Grenadines already has a recognised abbreviation, SVG. Where applicable they are enclosed within square brackets in the Option List.
US States now uses this facility for USPS state codes, substantially reducing input. Full stops and apostrophes can also be omitted and accepted as valid answers.
Typing the letter 'r' completes the abbreviation, which in this case filters out the remaining options. The above example also illustrates a further feature of input, case-insensitivity.
The UK is a special case where its abbreviation does not filter to a single option but is selected since it is complete. You may therefore press the Enter/Go key to submit or continue typing to filter it out.
This facility has been used for alternative inputs such as Ivory Coast for Cote d'Ivoire. You can find them all by scrolling the full list.
Selection can also be made by directly interacting with the Option List itself. Tap or click the input field at any time to show or hide it. Nothing is displayed where no options match the text in the input field, whereas all options are available when there is none.
The list can be swiped as usual on touch screens or scrolled with the mouse wheel on computers. Items are selected by tapping or clicking them. Press the Submit button or the Enter/Go key to submit your answer. Of course you may use a combination of typing and the Option List.
The Down Arrow key can also be used on computers to activate the option list if hidden. Use the Up and Down keys to scroll and dynamically make selections, then press Enter when ready. This can also be done in Quick Select mode.
User preferences are saved in the Android app and, if permitted, your browser's local storage, so your settings and whether you closed during a test can be restored. If you have more correct than wrong answers you are asked whether you wish to resume the test next time you launch the app.
If granted, local storage is also used for app data to minimise load time.
27/05/2026
Updated: Rolling Display Mode moves on every seven and a half seconds.
24/05/2026
Updated: Show city during City Test reviews.
Updated: Show the USPS State code in Display Mode.
Updated: Option List now includes Unicode characters but filtered in ASCII.
Updated: Images better scaled on iPhones during tests.
]
15/05/2026
Added: USPS State codes as abbreviations.
13/06/2026
Updated: Use local storage to save and retrieve state data if allowed.
Updated: Questions are no longer repeated after three wrong answers but can be
reviewed at end of test.
Updated: Next scheduled image is preloaded when current one displayed.
Updated: Layout has been further improved to adapt to more devices and orientation
changes.
Updated: Reverted to png map files that have now been compressed.
Removed: Timed test button as timed tests are no longer planned.
06/04/2026
Updated: Repackaged map files as jpg for smaller file sizes.
10/03/2026
Updated: New layout for computer screens in landscape view.
Updated: Buttons with images rather than text.
Added: New test option buttons.
Updated: Improved reliability of audible feedback.
18/02/2026
Fixed: Issues with input, especially after backspacing.
13/02/2026
Updated: Progress bar and timer reset when following links in Rolling Display Mode.
Updated: Maps properly accredited.
Fixed: Input re-enabled when changing mode or test type when showing correct answer.
Updated: State capital question placed higher up page.
08/02/2026
Updated: Resized buttons to accommodate translated text.
05/02/2026
Added: Tests saved in local storage for resuming at next launch.
Added: ID or index field to Option List items.
Allowed: Numerals no longer excluded from input to facilitate Unicode characters
when using a computer in a foreign language.
Updated: Fixed and Rolling Display Modes combined into one since introduction of
the Play/Pause button.
11/01/2026
Fixed: Option list resized for small screens.
09/01/2026
Added: Flag/Map View included in user preferences.
07/01/2026
Added: User preferences to Android app and web browser if permitted
(Kiddle/Wikipedia & launch in Display/Test Mode).
Barring the updated Minnesota and Utah flags, all flags have been
sourced from Flagpedia.net.
All maps, with minor edits, are sourced from
Wikimedia Commons, a vast collection of free to use resources.
You are free to use and distribute this software or web package provided it is accredited and supplied in its entirety with no alteration and that no fee is charged. All source code remains the property of Coe Operations.
© Coe Operations June 2025