One day, a bunch of these Spanish explorers came downstream. They anchored a place farther west at the mouth of Lamunan River called Ansig. They stumbled on a small hut by the river’s bank where an old woman was fond winnowing pounded palay. One of them asked her, "Como se Llama Este Lugar" not knowing the native language of course.  

Much to the old woman’s surprise and perhaps excitement, she replied without much ado "Pasi" which means some of the unhusked rice on her basket held in both hands. She must have thought that they were eager to know what was in the basket and what she was dong, because she could not understand their language.  

From that time on, the Spanish begun to call the place "Pasi" at first. The word later evolved to be known by its present "Passi."  

Since then the settlement founded by Dig-on, Tokiab, and Umawang became known as Passi.

Passi is geographically located at South of Dumarao.

City of Passi- has an average annual income of P20,369,027.21 as of 1997 based on the 1991 constant prices as certified by DOF. It is composed of 49 rural barangays and 2 urban barangays.

Passi has a total land area of 25,139 hectares or 251.3931 square kilometers, which are approximately 5.39 percent of the total land area of the whole province of Iloilo.  

  
Topography   

The topography of Passi is relatively dominated by rolling hills and narrow valley plains. The flat land stretches alongside the Jalaur and Lamunan River.  

Climate  

Has no pronounced maximum rain period and no distinct dry and wet season. While it is not within a province of Iloilo occasionally.  

Mineral Resources   

Passi cannot boost of any mineral resources that can be mined or extracted commercially except for the and gravel which can be considered of best quality for concrete works and limestone which can be processed into lime for agricultural and industrial application. The supply of sand and gravel can be considered inexhaustiable and lime production is estimated at 2,240 tons monthly with only 81 registered limestone/quarry.

Industrial development is one of the priority concerned of the Municipality being one of the five districts which was elected as one site for people’s Industrial Enterprises (PIE’s) District Agro-Industrial center (DAIC). The PIE’s?DAIC will either provide intermediate processing of indigenous raw materials produced in their respective influence area for final processing at the DAIC. They can also manufacture finished goods if their comparative advantage for such manufacturing activities would prove viable.
 

• New Frontier Sugar Corp. - Brgy. Man-it, Passi City
• Agela Rice Mill - Brgy. Imbang Gde., Passi City
• Nene Soling Rice Mill - Brgy. Gines Viejo, Passi City
• AGF Rice Mill LMP Rice Mill - Brgy. Sablogon, Passi City
• CELCON Agro-Industrial Corp. - Brgy. Sablogon, Passi City
• Palomo Piggery - Brgy. Sablogon, Passi City
• Admiral Poultry Farm - Brgy. Imbang Gde., Passi City
• Poultry Farm - Brgy. Imbang Gde., Passi City
• PLDC Piggery Farm - Brgy. Imbang Gde., Passi City
• Pag-asa Shell Station - Simeon Aguilar St., Passi City
• Passi Petron Station - F. Palmares St., Passi City
• Passi Caltex Station - Simeon Aguilar St., Passi City
• Palmares-Tiongson Agro-Industrial Corporation - Railway St., Passi City
• Nanding’s Hollowblocks - San Roque St., Passi City
• Pamplona’s Hollowblocks - Simeon Aguilar St., Passi City
• Lyn Concrete Product - Railway St. , Passi City
• Sta. Ana Hollowblocks - Ex. Gov. Alfelor St., Passi City
• Passi Concrete Product - Sara road Passi City
• Jalasig Sugarcane Planters Assn. - Brgy. Bacuran, Passi City
• KLT Pineapple Processing - Brgy. Imbang Gde., Passi City
• DELSUM Rice Mill - Brgy. Gimes Viejo, Passi City
• Furniture Shop - Brgy. Gimes Viejo, Passi City
• Nene Jane Concrete Product - Sara Rd., Passi City
• Ana’s Hollowblocks Factory - Brgy. Tubod, Passi City

• Cueva ni Musyo  at Brgy. Bayan, 10 kms. From the Poblacion with a fare of P5.00
• Iliman it Maya Spring at Brgy. Magdungao, 17 kms. from the Poblacion and a walking distance at 3 kms. from Magdungao Proper with a fare of P10.00
• Bayebaye Cave at Brgy. Imbang Gde., 2 kms. to and from the Poblacion with a fare of P5.00
• Sta. Maria Cave at Brgy. Bayan, 8 kms. from the poblacion with a fare of P 5.00.
• Maanghit Cave of Brgy. Sarapan, 12 kms. from the Poblacion with a fare of P  7.00
• Kawilihan Resort at Brgy. Bacuran, 4 kms. from the Poblacion with a fare of P 5.00
• Tarug  at Brgy. Bayan, 8 kms. from the Poblacion with a fare of P 7.00.
• Jaluar Bridge
• Passi Residencia (Old Municipal Bldg.)

Tourist Facilities

Restaurants/Cafeterias – 43 

Resort  - Kawilihan Resort Brgy. Bacuran, 4 kms. from the Poblacion with a fare of P5.00.   

Movie Houses – 3   

Sports Recreation Center/Gymnasium – 1   

Other Entertainment Facilities 

• Nullberry - Salvacion Street, Passi City
• Triple Luck - Semeon Aguilar Street, Passi City

National Road - 35 kms. 
Provincial Road - 78.660 kms. 
Municipal Road - 7.615 kms. 
Barangay Raod - 332.117 kms.

Bridges  

National - 101 L.M. 
Provincial - 30 L.M.  
Barangay - 311 L.M.

Post Offices – 1   

Communication Facilities    

RCPI, PT&T, PANTELCO, PLDT, SMART, VHF Radios, ISLACOM

Banks – 4   

Medical Facilities   

• Clinics – 5
• Hospitals – 1
• Pharmacies – 9

Schools

Pre-elementary
Private – 8 Public – 2 Primary – 4
Intermediate
Private – 1 Public – 32
Secondary
National High School – 4 Trade School – 1  
Barangay High School – 1
Passi Trade School - 1