| Date Filed | Type | Ordinance | Map Status | Notes |
| 2024-06-25 | Annexation
(TIFF) (PDF) | 2009-011 | IN PROGRESS | Tract located adjacent to the present boundaries of the City of Union, owned by Arlinghaus: 20.309 acres. |
| 2024-06-25 | Resolution
(TIFF) (PDF) | 2024-07 | IN PROGRESS | Restates the location of Annexation Ordinance 2009-011 |
| 2024-06-25 | Annexation
(TIFF) (PDF) | 2015-07 | IN PROGRESS | Union Road (formerly Old US 42), approximately 0.25 miles south of Kentucky SR 536 at its intersection with Hathaway and Mt. Zion Roads: 42.18 acres |
| 2024-06-25 | Resolution
(TIFF) (PDF) | 2024-08 | IN PROGRESS | Restates the location of Annexation Ordinance 2015-07. |
| 2024-06-25 | Annexation
(TIFF) (PDF) | 2017-15 | IN PROGRESS | Located at the most northwesterly corner of the original 1 square mile area of incorporation of the City of Union near Old Union Road and Long Branch Road: 0.08 acres |
| 2024-06-25 | Resolution
(TIFF) (PDF) | 2024-09 | IN PROGRESS | Restates the location of Annexation Ordinance 2017-15 |
| 2023-9-29 | Annexation
(TIFF) (PDF) | 2021-8 | MAPPABLE | Tract of land lying south of Longbranch Road and east of Ballyshannon Drive, owned by Timothy and Christie Kahmann: 7.533 acres |
| 2023-9-29 | Annexation
(TIFF) (PDF) | 2021-7 | MAPPABLE | Located on the west side of Clakston Lane, owned by Robert A. Kahmann Trust: 151.706 acres |
| 2022-11-15 | Correction of Electronic File | Annexation Ordinance 2022-19 | MAPPABLE | Received & forwarded to the state mapping office this date. |
| 2022-11-09 | Annexation
(TIFF) (PDF) | 2022-19 | MAPPABLE | Arlinghaus I, LLC, Tract located along Hathaway Road: 81.293 acres |
| 2020-05-21 | Population Estimate | | | U. S. Census Bureau Population Estimate as of July 1, 2019: 6,034 |
| 2019-05-23 | Population Estimate | | | U. S. Census Bureau Population Estimate as of July 1, 2018: 5,930 |
| 2019-01-10 | Annexation
(TIFF) (PDF) | 2018-09 | MAPPABLE | Drees Company Tract located on the north side of Frogtown Road approximately 950' east of US 42: 87.247 acres. |
| 2018-05-24 | Population Estimate | | | U. S. Census Bureau Population Estimate as of July 1, 2017: 5,895 |
| 2016-05-19 | Population Estimate | | | U. S. Census Bureau Population Estimate as of July 1, 2015: 5,795 |
| 2015-05-21 | Population (2010) | | | Population Total per 2010 U.S. Decennial Census: 5,379 |
| 2014-07-25 | Declaration
(TIFF) (PDF) | pursuant to HB 331 (2014) | | Acknowledgment of Reclassification (Home Rule), Statement of Form of Government (Mayor-Commission), Name of City, & Year of Incorporation |
| 2007-04-30 | Annexation | 2007-001 | MAPPABLE | Tract 1: 1409 Mt. Zion Rd (4.3772a) & Tract 2: 1437 Mt. Zion Rd (4.3736a) |
| 2006-05-04 | Notification of Vacancy | | | City Commissioner |
| 2006-01-27 | Annexation | 2005-005 | MAPPABLE | Union Point Centre: 4 tracts (18.2957 acres) |
| 2005-03-11 | Reclassification | House Bill 67 | | Transferred from 5th Class to 4th Class due to population increase. Effective June 20, 2005 |
| 2005-03-11 | Legislative Research Commission Filing | KRS 81.036 | | City Documents Requesting Reclassification |
| 2004-12-20 | Annexation | 04-007 | MAPPABLE | Hampshire Subdivision Tract |
| 2000-04-14 | Resignation | | | City Commission |
| 2000-02-22 | Reclassification | House Bill 257 | | Transferred from 6th to 5th class |
| 1999-11-08 | Property Transfer | 97-003 | MAPPABLE | Conveyances between Union & Florence |
| 1999-11-08 | Annexation | 99-006 | MAPPABLE | Map Not Included |
| 1999-11-08 | Annexation | 95-006 | MAPPABLE | Map Not Included |
| 1999-11-08 | Annexation | 99-005 | MAPPABLE | |
| 1997-05-26 | Transfer & Acceptance | 0-10-97 | MAPPABLE | Property trade between Union & Florence |
| 1981-06-25 | KRS 81.045 Filing | | MAPPABLE | |
