While several, individual mesolithic items have been found in the municipality, the first evidence of a settlement are two Hallstatt era graves.

The monasteries of Hermetschwil and Gnadental as well as citizens and institutions of Bremgarten held property in both villages.

Between 1529-31 the Protestant Reformation entered Fischbach-Göslikon, though today more of the population remains Roman Catholic.

The Reuss River Corrections of 1811-18, 1906–15 and 1935–50 changed the landscape and settlement pattern of Fischbach-Göslikon.

Of the rest of the land, 16.8% is settled (buildings or roads) and the remainder (11.6%) is non-productive (rivers or lakes).

[4] The municipality is located in the Bremgarten district, on the left bank of the Reuss river and along the Bremgarten-Mellingen road.

The blazon of the municipal coat of arms is Gules a Fish embowed Argent.

[4] The age distribution, as of 2008[update], in Fischbach-Göslikon is; 170 children or 12.2% of the population are between 0 and 9 years old and 187 teenagers or 13.5% are between 10 and 19.

[9] About 68.3% of the total households were owner occupied, or in other words did not pay rent (though they may have a mortgage or a rent-to-own agreement).

[11] The historical population is given in the following table:[3] The Roman Catholic parish church of the Assumption of Mary (German: Maria Himmelfahrt) is listed as a Swiss heritage site of national significance.

[4] From the 2000 census[update], 709 or 56.5% were Roman Catholic, while 352 or 28.1% belonged to the Swiss Reformed Church.